diff --git a/backend/internal/domain/market/feedback.go b/backend/internal/domain/market/feedback.go
new file mode 100644
index 0000000..91e0f39
--- /dev/null
+++ b/backend/internal/domain/market/feedback.go
@@ -0,0 +1,128 @@
+package market
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"log/slog"
+	"time"
+
+	"github.com/google/uuid"
+
+	"marktvogt.de/backend/internal/pkg/email"
+)
+
+const (
+	FeedbackCategoryIncorrect = "incorrect_data"
+	FeedbackCategoryMissing   = "missing_data"
+	FeedbackCategoryDuplicate = "duplicate"
+	FeedbackCategoryOther     = "other"
+
+	FeedbackStatusNew      = "new"
+	FeedbackStatusTriaged  = "triaged"
+	FeedbackStatusResolved = "resolved"
+	FeedbackStatusSpam     = "spam"
+)
+
+var validFeedbackCategories = map[string]bool{
+	FeedbackCategoryIncorrect: true,
+	FeedbackCategoryMissing:   true,
+	FeedbackCategoryDuplicate: true,
+	FeedbackCategoryOther:     true,
+}
+
+type Feedback struct {
+	ID           uuid.UUID
+	MarketID     *uuid.UUID
+	MarketSlug   string
+	Category     string
+	Email        string
+	Message      string
+	DuplicateURL string
+	Status       string
+	RemoteIP     string
+	CreatedAt    time.Time
+}
+
+type SubmitFeedbackRequest struct {
+	Category       string `json:"category" validate:"required,oneof=incorrect_data missing_data duplicate other"`
+	Email          string `json:"email" validate:"required,email"`
+	Message        string `json:"message" validate:"required,min=10,max=5000"`
+	DuplicateURL   string `json:"duplicate_url" validate:"omitempty,url,max=500"`
+	TurnstileToken string `json:"turnstile_token" validate:"required"`
+}
+
+type SubmitFeedbackResponse struct {
+	Data SubmitFeedbackResponseData `json:"data"`
+}
+
+type SubmitFeedbackResponseData struct {
+	Message string `json:"message"`
+}
+
+var ErrFeedbackDuplicateURLRequired = errors.New("duplicate_url required for duplicate category")
+
+func (s *Service) SubmitFeedback(ctx context.Context, slug string, req SubmitFeedbackRequest, remoteIP string) error {
+	if !validFeedbackCategories[req.Category] {
+		return fmt.Errorf("invalid category %q", req.Category)
+	}
+	if req.Category == FeedbackCategoryDuplicate && req.DuplicateURL == "" {
+		return ErrFeedbackDuplicateURLRequired
+	}
+
+	if err := s.turnstile.Verify(ctx, req.TurnstileToken, remoteIP); err != nil {
+		return fmt.Errorf("turnstile: %w", err)
+	}
+
+	m, err := s.repo.GetBySlug(ctx, slug)
+	if err != nil {
+		return fmt.Errorf("looking up market for feedback: %w", err)
+	}
+
+	fb := Feedback{
+		MarketID:     &m.ID,
+		MarketSlug:   slug,
+		Category:     req.Category,
+		Email:        req.Email,
+		Message:      req.Message,
+		DuplicateURL: req.DuplicateURL,
+		Status:       FeedbackStatusNew,
+		RemoteIP:     remoteIP,
+	}
+
+	if _, err := s.repo.CreateFeedback(ctx, fb); err != nil {
+		return fmt.Errorf("creating feedback: %w", err)
+	}
+
+	if s.email != nil && s.adminEmail != "" {
+		go s.sendFeedbackNotification(m, slug, req)
+	}
+
+	return nil
+}
+
+func (s *Service) sendFeedbackNotification(m Market, slug string, req SubmitFeedbackRequest) {
+	subject := fmt.Sprintf("Markt-Feedback (%s): %s", req.Category, m.Name)
+	body := fmt.Sprintf(
+		"Neues Feedback zum Markt:\n\nName: %s\nSlug: %s\nKategorie: %s\nE-Mail: %s\n%sNachricht:\n%s\n\nMarkt im Admin-Panel: %s/admin/maerkte/%s/bearbeiten",
+		m.Name, slug, req.Category, req.Email,
+		duplicateURLLine(req),
+		req.Message,
+		s.frontendURL, m.ID,
+	)
+
+	if err := s.email.Send(context.Background(), email.Message{
+		To:      s.adminEmail,
+		Subject: subject,
+		Body:    body,
+	}); err != nil {
+		slog.Error("failed to send feedback notification", "error", err)
+	}
+}
+
+func duplicateURLLine(req SubmitFeedbackRequest) string {
+	if req.Category == FeedbackCategoryDuplicate && req.DuplicateURL != "" {
+		return fmt.Sprintf("Duplikat-URL: %s\n", req.DuplicateURL)
+	}
+	return ""
+}
diff --git a/backend/internal/domain/market/feedback_handler.go b/backend/internal/domain/market/feedback_handler.go
new file mode 100644
index 0000000..4ca82b0
--- /dev/null
+++ b/backend/internal/domain/market/feedback_handler.go
@@ -0,0 +1,59 @@
+package market
+
+import (
+	"errors"
+	"log/slog"
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+
+	"marktvogt.de/backend/internal/pkg/apierror"
+	"marktvogt.de/backend/internal/pkg/turnstile"
+	"marktvogt.de/backend/internal/pkg/validate"
+)
+
+type FeedbackHandler struct {
+	service *Service
+}
+
+func NewFeedbackHandler(service *Service) *FeedbackHandler {
+	return &FeedbackHandler{service: service}
+}
+
+func (h *FeedbackHandler) Submit(c *gin.Context) {
+	slug := c.Param("slug")
+	if slug == "" {
+		apiErr := apierror.BadRequest("invalid_slug", "missing market slug")
+		c.JSON(apiErr.Status, apierror.NewResponse(apiErr))
+		return
+	}
+
+	var req SubmitFeedbackRequest
+	if apiErr := validate.BindJSON(c, &req); apiErr != nil {
+		c.JSON(apiErr.Status, apierror.NewResponse(apiErr))
+		return
+	}
+
+	err := h.service.SubmitFeedback(c.Request.Context(), slug, req, c.ClientIP())
+	switch {
+	case err == nil:
+		c.JSON(http.StatusAccepted, SubmitFeedbackResponse{
+			Data: SubmitFeedbackResponseData{
+				Message: "Vielen Dank! Dein Feedback wurde uebermittelt.",
+			},
+		})
+	case errors.Is(err, ErrFeedbackDuplicateURLRequired):
+		apiErr := apierror.BadRequest("duplicate_url_required", "Bitte gib die URL des Duplikats an.")
+		c.JSON(apiErr.Status, apierror.NewResponse(apiErr))
+	case errors.Is(err, turnstile.ErrVerificationFailed):
+		apiErr := apierror.BadRequest("turnstile_failed", "spam protection verification failed")
+		c.JSON(apiErr.Status, apierror.NewResponse(apiErr))
+	case errors.Is(err, ErrMarketNotFound):
+		apiErr := apierror.NotFound("market")
+		c.JSON(apiErr.Status, apierror.NewResponse(apiErr))
+	default:
+		slog.ErrorContext(c.Request.Context(), "submit feedback failed", "error", err, "slug", slug)
+		apiErr := apierror.Internal("failed to submit feedback")
+		c.JSON(apiErr.Status, apierror.NewResponse(apiErr))
+	}
+}
diff --git a/backend/internal/domain/market/feedback_repo.go b/backend/internal/domain/market/feedback_repo.go
new file mode 100644
index 0000000..8aaaa24
--- /dev/null
+++ b/backend/internal/domain/market/feedback_repo.go
@@ -0,0 +1,29 @@
+package market
+
+import (
+	"context"
+	"fmt"
+)
+
+func (r *pgRepository) CreateFeedback(ctx context.Context, fb Feedback) (Feedback, error) {
+	const query = `
+		INSERT INTO market_feedback (
+			market_id, market_slug, category, email, message,
+			duplicate_url, status, remote_ip
+		) VALUES ($1, $2, $3, $4, $5, $6, $7, $8)
+		RETURNING id, created_at
+	`
+
+	if fb.Status == "" {
+		fb.Status = FeedbackStatusNew
+	}
+
+	if err := r.db.QueryRow(ctx, query,
+		fb.MarketID, fb.MarketSlug, fb.Category, fb.Email, fb.Message,
+		fb.DuplicateURL, fb.Status, fb.RemoteIP,
+	).Scan(&fb.ID, &fb.CreatedAt); err != nil {
+		return Feedback{}, fmt.Errorf("inserting feedback: %w", err)
+	}
+
+	return fb, nil
+}
diff --git a/backend/internal/domain/market/feedback_test.go b/backend/internal/domain/market/feedback_test.go
new file mode 100644
index 0000000..063016f
--- /dev/null
+++ b/backend/internal/domain/market/feedback_test.go
@@ -0,0 +1,145 @@
+package market
+
+import (
+	"context"
+	"errors"
+	"testing"
+
+	"github.com/google/uuid"
+)
+
+type stubTurnstile struct {
+	err error
+}
+
+func (s stubTurnstile) Verify(_ context.Context, _, _ string) error { return s.err }
+
+// stubFeedbackRepo implements just enough of Repository for SubmitFeedback tests.
+// Everything else panics, since SubmitFeedback doesn't call those paths.
+type stubFeedbackRepo struct {
+	Repository
+	getBySlug      func(ctx context.Context, slug string) (Market, error)
+	createFeedback func(ctx context.Context, fb Feedback) (Feedback, error)
+	createdCalls   int
+	lastCreated    Feedback
+}
+
+func (s *stubFeedbackRepo) GetBySlug(ctx context.Context, slug string) (Market, error) {
+	return s.getBySlug(ctx, slug)
+}
+
+func (s *stubFeedbackRepo) CreateFeedback(ctx context.Context, fb Feedback) (Feedback, error) {
+	s.createdCalls++
+	s.lastCreated = fb
+	if s.createFeedback != nil {
+		return s.createFeedback(ctx, fb)
+	}
+	fb.ID = uuid.New()
+	return fb, nil
+}
+
+func newFeedbackService(t *testing.T, repo Repository, ts stubTurnstile) *Service {
+	t.Helper()
+	return &Service{
+		repo:        repo,
+		turnstile:   ts,
+		frontendURL: "https://example.test",
+	}
+}
+
+func TestSubmitFeedback_RejectsInvalidCategory(t *testing.T) {
+	svc := newFeedbackService(t, &stubFeedbackRepo{}, stubTurnstile{})
+
+	err := svc.SubmitFeedback(context.Background(), "some-slug", SubmitFeedbackRequest{
+		Category:       "spam_us",
+		Email:          "user@example.com",
+		Message:        "valid message text",
+		TurnstileToken: "tok",
+	}, "1.2.3.4")
+
+	if err == nil {
+		t.Fatal("expected error for invalid category, got nil")
+	}
+}
+
+func TestSubmitFeedback_DuplicateRequiresURL(t *testing.T) {
+	svc := newFeedbackService(t, &stubFeedbackRepo{}, stubTurnstile{})
+
+	err := svc.SubmitFeedback(context.Background(), "some-slug", SubmitFeedbackRequest{
+		Category:       FeedbackCategoryDuplicate,
+		Email:          "user@example.com",
+		Message:        "valid message text",
+		TurnstileToken: "tok",
+	}, "1.2.3.4")
+
+	if !errors.Is(err, ErrFeedbackDuplicateURLRequired) {
+		t.Fatalf("expected ErrFeedbackDuplicateURLRequired, got %v", err)
+	}
+}
+
+func TestSubmitFeedback_TurnstileFailureSkipsRepo(t *testing.T) {
+	wantErr := errors.New("turnstile rejected")
+	repo := &stubFeedbackRepo{
+		getBySlug: func(_ context.Context, _ string) (Market, error) {
+			t.Fatal("repo should not be called when turnstile fails")
+			return Market{}, nil
+		},
+	}
+	svc := newFeedbackService(t, repo, stubTurnstile{err: wantErr})
+
+	err := svc.SubmitFeedback(context.Background(), "some-slug", SubmitFeedbackRequest{
+		Category:       FeedbackCategoryOther,
+		Email:          "user@example.com",
+		Message:        "valid message text",
+		TurnstileToken: "tok",
+	}, "1.2.3.4")
+
+	if err == nil || !errors.Is(err, wantErr) {
+		t.Fatalf("expected wrapped turnstile error, got %v", err)
+	}
+	if repo.createdCalls != 0 {
+		t.Fatalf("expected 0 CreateFeedback calls, got %d", repo.createdCalls)
+	}
+}
+
+func TestSubmitFeedback_PersistsWithMarketID(t *testing.T) {
+	marketID := uuid.New()
+	repo := &stubFeedbackRepo{
+		getBySlug: func(_ context.Context, slug string) (Market, error) {
+			if slug != "ronneburg-2026" {
+				t.Fatalf("unexpected slug: %s", slug)
+			}
+			return Market{ID: marketID, Name: "Ronneburg 2026"}, nil
+		},
+	}
+	svc := newFeedbackService(t, repo, stubTurnstile{})
+
+	err := svc.SubmitFeedback(context.Background(), "ronneburg-2026", SubmitFeedbackRequest{
+		Category:       FeedbackCategoryDuplicate,
+		Email:          "user@example.com",
+		Message:        "Same as the other Ronneburg market",
+		DuplicateURL:   "https://marktvogt.de/markt/ronneburg-2026-old",
+		TurnstileToken: "tok",
+	}, "1.2.3.4")
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if repo.createdCalls != 1 {
+		t.Fatalf("expected 1 CreateFeedback call, got %d", repo.createdCalls)
+	}
+	if repo.lastCreated.MarketID == nil || *repo.lastCreated.MarketID != marketID {
+		t.Fatalf("expected market_id %s, got %v", marketID, repo.lastCreated.MarketID)
+	}
+	if repo.lastCreated.MarketSlug != "ronneburg-2026" {
+		t.Fatalf("expected slug ronneburg-2026, got %q", repo.lastCreated.MarketSlug)
+	}
+	if repo.lastCreated.DuplicateURL != "https://marktvogt.de/markt/ronneburg-2026-old" {
+		t.Fatalf("expected duplicate URL preserved, got %q", repo.lastCreated.DuplicateURL)
+	}
+	if repo.lastCreated.Status != FeedbackStatusNew {
+		t.Fatalf("expected status %q, got %q", FeedbackStatusNew, repo.lastCreated.Status)
+	}
+	if repo.lastCreated.RemoteIP != "1.2.3.4" {
+		t.Fatalf("expected remote IP recorded, got %q", repo.lastCreated.RemoteIP)
+	}
+}
diff --git a/backend/internal/domain/market/repository.go b/backend/internal/domain/market/repository.go
index a6e5fde..6bd30da 100644
--- a/backend/internal/domain/market/repository.go
+++ b/backend/internal/domain/market/repository.go
@@ -41,6 +41,9 @@ type Repository interface {
 	SlugExists(ctx context.Context, slug string) (bool, error)
 	FindSimilar(ctx context.Context, id uuid.UUID, name, city string, startDate, endDate time.Time) ([]DuplicateCandidate, error)
 
+	// Feedback
+	CreateFeedback(ctx context.Context, fb Feedback) (Feedback, error)
+
 	// Merge audit log
 	InsertMergeLog(ctx context.Context, entry MergeLogEntry) error
 
diff --git a/backend/internal/domain/market/routes.go b/backend/internal/domain/market/routes.go
index 131ebb3..94687ab 100644
--- a/backend/internal/domain/market/routes.go
+++ b/backend/internal/domain/market/routes.go
@@ -2,12 +2,13 @@ package market
 
 import "github.com/gin-gonic/gin"
 
-func RegisterRoutes(rg *gin.RouterGroup, h *Handler, subH *SubmissionHandler, geoH *GeocodeHandler, submitLimit, geocodeLimit gin.HandlerFunc) {
+func RegisterRoutes(rg *gin.RouterGroup, h *Handler, subH *SubmissionHandler, geoH *GeocodeHandler, fbH *FeedbackHandler, submitLimit, geocodeLimit, feedbackLimit gin.HandlerFunc) {
 	markets := rg.Group("/markets")
 	{
 		markets.GET("", h.Search)
 		markets.GET("/:slug", h.GetBySlug)
 		markets.POST("/submit", submitLimit, subH.Submit)
+		markets.POST("/:slug/feedback", feedbackLimit, fbH.Submit)
 	}
 
 	rg.POST("/geocode", geocodeLimit, geoH.Geocode)
diff --git a/backend/internal/server/routes.go b/backend/internal/server/routes.go
index 7a68e57..abfd6ce 100644
--- a/backend/internal/server/routes.go
+++ b/backend/internal/server/routes.go
@@ -83,10 +83,12 @@ func (s *Server) registerRoutes() {
 	marketSvc := market.NewServiceFull(marketRepo, emailSender, tsVerifier, geocoder, s.cfg.Notification.AdminEmail, s.cfg.Notification.FrontendURL)
 	marketHandler := market.NewHandler(marketSvc)
 	submissionHandler := market.NewSubmissionHandler(marketSvc)
+	feedbackHandler := market.NewFeedbackHandler(marketSvc)
 	geocodeHandler := market.NewGeocodeHandler(geocoder)
-	submitLimit := middleware.RateLimit(3.0/3600.0, 3)  // 3 per hour per IP
-	geocodeLimit := middleware.RateLimit(10.0/60.0, 10) // 10 per minute per IP
-	market.RegisterRoutes(v1, marketHandler, submissionHandler, geocodeHandler, submitLimit, geocodeLimit)
+	submitLimit := middleware.RateLimit(3.0/3600.0, 3)   // 3 per hour per IP
+	geocodeLimit := middleware.RateLimit(10.0/60.0, 10)  // 10 per minute per IP
+	feedbackLimit := middleware.RateLimit(5.0/3600.0, 5) // 5 per hour per IP
+	market.RegisterRoutes(v1, marketHandler, submissionHandler, geocodeHandler, feedbackHandler, submitLimit, geocodeLimit, feedbackLimit)
 
 	// AI settings store + usage repo — used by AI provider and settings handler
 	encKey, err := apicrypto.DeriveKey([]byte(s.cfg.JWT.Secret))
diff --git a/backend/migrations/000032_market_feedback.down.sql b/backend/migrations/000032_market_feedback.down.sql
new file mode 100644
index 0000000..18c877e
--- /dev/null
+++ b/backend/migrations/000032_market_feedback.down.sql
@@ -0,0 +1 @@
+DROP TABLE IF EXISTS market_feedback;
diff --git a/backend/migrations/000032_market_feedback.up.sql b/backend/migrations/000032_market_feedback.up.sql
new file mode 100644
index 0000000..32b9501
--- /dev/null
+++ b/backend/migrations/000032_market_feedback.up.sql
@@ -0,0 +1,15 @@
+CREATE TABLE market_feedback (
+    id            UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    market_id     UUID REFERENCES market_editions(id) ON DELETE SET NULL,
+    market_slug   TEXT NOT NULL,
+    category      TEXT NOT NULL CHECK (category IN ('incorrect_data', 'missing_data', 'duplicate', 'other')),
+    email         TEXT NOT NULL,
+    message       TEXT NOT NULL,
+    duplicate_url TEXT NOT NULL DEFAULT '',
+    status        TEXT NOT NULL DEFAULT 'new' CHECK (status IN ('new', 'triaged', 'resolved', 'spam')),
+    remote_ip     TEXT NOT NULL DEFAULT '',
+    created_at    TIMESTAMPTZ NOT NULL DEFAULT now()
+);
+
+CREATE INDEX market_feedback_market_idx ON market_feedback (market_id, created_at DESC);
+CREATE INDEX market_feedback_status_idx ON market_feedback (status, created_at DESC);
diff --git a/web/src/lib/components/market/MarketFeedbackDialog.svelte b/web/src/lib/components/market/MarketFeedbackDialog.svelte
new file mode 100644
index 0000000..e21f17a
--- /dev/null
+++ b/web/src/lib/components/market/MarketFeedbackDialog.svelte
@@ -0,0 +1,206 @@
+<script lang="ts">
+	import { enhance } from '$app/forms';
+	import Button from '$lib/components/ui/Button.svelte';
+	import Alert from '$lib/components/ui/Alert.svelte';
+
+	interface Props {
+		open: boolean;
+		marketName: string;
+		turnstileSiteKey: string;
+		form: {
+			error?: string;
+			category?: string;
+			email?: string;
+			message?: string;
+			duplicateUrl?: string;
+			feedback?: { success: boolean };
+		} | null;
+		onClose: () => void;
+	}
+
+	let { open, marketName, turnstileSiteKey, form, onClose }: Props = $props();
+
+	let dialogEl = $state<HTMLDialogElement | null>(null);
+	let loading = $state(false);
+	let category = $state(form?.category ?? 'incorrect_data');
+
+	$effect(() => {
+		if (!dialogEl) return;
+		if (open && !dialogEl.open) {
+			dialogEl.showModal();
+		} else if (!open && dialogEl.open) {
+			dialogEl.close();
+		}
+	});
+
+	$effect(() => {
+		if (form?.feedback?.success && dialogEl?.open) {
+			// Keep open briefly to show the success state, then close.
+			const t = setTimeout(() => onClose(), 2500);
+			return () => clearTimeout(t);
+		}
+	});
+
+	function handleBackdropClick(e: MouseEvent) {
+		if (e.target === dialogEl) onClose();
+	}
+</script>
+
+<svelte:head>
+	{#if turnstileSiteKey}
+		<script src="https://challenges.cloudflare.com/turnstile/v0/api.js" async defer></script>
+	{/if}
+</svelte:head>
+
+<dialog
+	bind:this={dialogEl}
+	onclose={onClose}
+	onclick={handleBackdropClick}
+	class="bg-vellum w-full max-w-lg rounded-lg p-0 backdrop:bg-stone-900/50 dark:bg-stone-800"
+>
+	<div class="border-b border-stone-200 px-6 py-4 dark:border-stone-700">
+		<h2 class="text-lg font-semibold text-stone-900 dark:text-stone-100">
+			Feedback zu „{marketName}"
+		</h2>
+		<p class="mt-1 text-sm text-stone-500 dark:text-stone-400">
+			Hilf uns, die Daten korrekt und vollstaendig zu halten.
+		</p>
+	</div>
+
+	{#if form?.feedback?.success}
+		<div class="px-6 py-6">
+			<Alert variant="success">Danke! Dein Feedback wurde uebermittelt und wird geprueft.</Alert>
+			<div class="mt-4 flex justify-end">
+				<Button variant="secondary" onclick={onClose}>Schliessen</Button>
+			</div>
+		</div>
+	{:else}
+		<form
+			method="POST"
+			action="?/feedback"
+			class="px-6 py-5"
+			use:enhance={() => {
+				loading = true;
+				return async ({ update }) => {
+					loading = false;
+					await update();
+				};
+			}}
+		>
+			{#if form?.error}
+				<div class="mb-4">
+					<Alert variant="error">{form.error}</Alert>
+				</div>
+			{/if}
+
+			<div class="space-y-4">
+				<div class="space-y-1">
+					<label
+						for="fb_category"
+						class="block text-sm font-medium text-stone-700 dark:text-stone-200"
+					>
+						Kategorie *
+					</label>
+					<select
+						id="fb_category"
+						name="category"
+						bind:value={category}
+						required
+						class="bg-vellum focus:border-primary-500 focus:ring-primary-500 w-full rounded-lg border border-stone-300 px-3 py-2 text-sm shadow-sm focus:ring-2 focus:outline-none dark:border-stone-600 dark:bg-stone-800"
+					>
+						<option value="incorrect_data">Falsche Angaben</option>
+						<option value="missing_data">Fehlende Angaben</option>
+						<option value="duplicate">Duplikat eines anderen Marktes</option>
+						<option value="other">Sonstiges</option>
+					</select>
+				</div>
+
+				{#if category === 'duplicate'}
+					<div class="space-y-1">
+						<label
+							for="fb_duplicate_url"
+							class="block text-sm font-medium text-stone-700 dark:text-stone-200"
+						>
+							URL des Duplikats *
+						</label>
+						<input
+							id="fb_duplicate_url"
+							name="duplicate_url"
+							type="url"
+							required
+							placeholder="https://marktvogt.de/markt/..."
+							value={form?.duplicateUrl ?? ''}
+							class="bg-vellum focus:border-primary-500 focus:ring-primary-500 w-full rounded-lg border border-stone-300 px-3 py-2 text-sm shadow-sm focus:ring-2 focus:outline-none dark:border-stone-600 dark:bg-stone-800"
+						/>
+					</div>
+				{/if}
+
+				<div class="space-y-1">
+					<label
+						for="fb_email"
+						class="block text-sm font-medium text-stone-700 dark:text-stone-200"
+					>
+						Deine E-Mail *
+					</label>
+					<input
+						id="fb_email"
+						name="email"
+						type="email"
+						required
+						value={form?.email ?? ''}
+						class="bg-vellum focus:border-primary-500 focus:ring-primary-500 w-full rounded-lg border border-stone-300 px-3 py-2 text-sm shadow-sm focus:ring-2 focus:outline-none dark:border-stone-600 dark:bg-stone-800"
+					/>
+				</div>
+
+				<div class="space-y-1">
+					<label
+						for="fb_message"
+						class="block text-sm font-medium text-stone-700 dark:text-stone-200"
+					>
+						Nachricht *
+					</label>
+					<textarea
+						id="fb_message"
+						name="message"
+						required
+						minlength="10"
+						maxlength="5000"
+						rows="5"
+						placeholder="Beschreibe, was nicht stimmt oder fehlt."
+						class="bg-vellum focus:border-primary-500 focus:ring-primary-500 w-full rounded-lg border border-stone-300 px-3 py-2 text-sm shadow-sm focus:ring-2 focus:outline-none dark:border-stone-600 dark:bg-stone-800"
+						>{form?.message ?? ''}</textarea
+					>
+				</div>
+
+				<div
+					class="rounded-md bg-stone-100 p-3 text-xs leading-relaxed text-stone-600 dark:bg-stone-700/50 dark:text-stone-300"
+				>
+					<p class="font-medium text-stone-700 dark:text-stone-200">Hinweis zum Datenschutz</p>
+					<p class="mt-1">
+						Mit dem Absenden uebermittelst du: deine E-Mail-Adresse, Kategorie, Nachricht
+						{#if category === 'duplicate'}und die angegebene Duplikat-URL{/if}, sowie ID und Slug
+						dieses Marktes. Die E-Mail wird nur fuer Rueckfragen verwendet. Details siehe
+						<a href="/datenschutz" class="underline hover:no-underline">Datenschutzerklaerung</a>.
+					</p>
+				</div>
+
+				{#if turnstileSiteKey}
+					<div class="cf-turnstile" data-sitekey={turnstileSiteKey} data-theme="auto"></div>
+				{/if}
+			</div>
+
+			<div class="mt-6 flex items-center justify-end gap-2">
+				<Button type="button" variant="ghost" onclick={onClose} disabled={loading}>
+					Abbrechen
+				</Button>
+				<Button type="submit" variant="primary" {loading}>Senden</Button>
+			</div>
+		</form>
+	{/if}
+</dialog>
+
+<style>
+	dialog::backdrop {
+		background: rgba(28, 25, 23, 0.5);
+	}
+</style>
diff --git a/web/src/routes/markt/[slug]/+page.server.ts b/web/src/routes/markt/[slug]/+page.server.ts
index 31d3d34..d65b86c 100644
--- a/web/src/routes/markt/[slug]/+page.server.ts
+++ b/web/src/routes/markt/[slug]/+page.server.ts
@@ -1,7 +1,8 @@
-import type { PageServerLoad } from './$types.js';
+import type { Actions, PageServerLoad } from './$types.js';
 import { apiFetch, ApiClientError } from '$lib/api/client.js';
 import type { MarketDetail, EditionBrief } from '$lib/api/types.js';
-import { error } from '@sveltejs/kit';
+import { env } from '$env/dynamic/public';
+import { error, fail } from '@sveltejs/kit';
 
 export const load: PageServerLoad = async ({ params, url, fetch }) => {
 	const year = url.searchParams.get('year') ?? '';
@@ -11,7 +12,8 @@ export const load: PageServerLoad = async ({ params, url, fetch }) => {
 		const res = await apiFetch<MarketDetail>(`/markets/${params.slug}${query}`, { fetch });
 		return {
 			market: res.data,
-			editions: (res as unknown as { editions?: EditionBrief[] }).editions ?? []
+			editions: (res as unknown as { editions?: EditionBrief[] }).editions ?? [],
+			turnstileSiteKey: env.PUBLIC_TURNSTILE_SITE_KEY ?? ''
 		};
 	} catch (e) {
 		if (e instanceof ApiClientError && e.status === 404) {
@@ -20,3 +22,53 @@ export const load: PageServerLoad = async ({ params, url, fetch }) => {
 		error(500, { message: 'Fehler beim Laden des Marktes.' });
 	}
 };
+
+const FEEDBACK_CATEGORIES = ['incorrect_data', 'missing_data', 'duplicate', 'other'] as const;
+
+export const actions: Actions = {
+	feedback: async ({ params, request, fetch }) => {
+		const form = await request.formData();
+		const category = (form.get('category')?.toString() ?? '').trim();
+		const email = (form.get('email')?.toString() ?? '').trim();
+		const message = (form.get('message')?.toString() ?? '').trim();
+		const duplicateUrl = (form.get('duplicate_url')?.toString() ?? '').trim();
+		const turnstileToken = form.get('cf-turnstile-response')?.toString() ?? '';
+
+		const formState = { category, email, message, duplicateUrl };
+
+		if (!FEEDBACK_CATEGORIES.includes(category as (typeof FEEDBACK_CATEGORIES)[number])) {
+			return fail(400, { error: 'Bitte waehle eine Kategorie.', ...formState });
+		}
+		if (!email || !message) {
+			return fail(400, { error: 'Bitte fuelle alle Pflichtfelder aus.', ...formState });
+		}
+		if (message.length < 10) {
+			return fail(400, { error: 'Die Nachricht ist zu kurz (min. 10 Zeichen).', ...formState });
+		}
+		if (category === 'duplicate' && !duplicateUrl) {
+			return fail(400, { error: 'Bitte gib die URL des Duplikats an.', ...formState });
+		}
+		if (!turnstileToken) {
+			return fail(400, { error: 'Bitte bestaetige die Spam-Pruefung.', ...formState });
+		}
+
+		try {
+			await apiFetch(`/markets/${params.slug}/feedback`, {
+				method: 'POST',
+				body: JSON.stringify({
+					category,
+					email,
+					message,
+					duplicate_url: duplicateUrl,
+					turnstile_token: turnstileToken
+				}),
+				fetch
+			});
+
+			return { feedback: { success: true } };
+		} catch (err) {
+			const msg = err instanceof Error ? err.message : 'Unbekannter Fehler.';
+			return fail(500, { error: msg, ...formState });
+		}
+	}
+};
diff --git a/web/src/routes/markt/[slug]/+page.svelte b/web/src/routes/markt/[slug]/+page.svelte
index 3640d59..3e59ab3 100644
--- a/web/src/routes/markt/[slug]/+page.svelte
+++ b/web/src/routes/markt/[slug]/+page.svelte
@@ -1,5 +1,6 @@
 <script lang="ts">
 	import MarketMap from '$lib/components/market/MarketMap.svelte';
+	import MarketFeedbackDialog from '$lib/components/market/MarketFeedbackDialog.svelte';
 	import type {
 		MarketDetail,
 		OpeningHoursEntry,
@@ -8,9 +9,17 @@
 	} from '$lib/api/types.js';
 	import { stateToSlug, toSlug } from '$lib/utils/slug.js';
 
-	let { data } = $props();
+	let { data, form } = $props();
 	const market: MarketDetail = $derived(data.market);
 	const editions: EditionBrief[] = $derived(data.editions);
+	const isAdmin = $derived(data.user?.role === 'admin');
+
+	let feedbackOpen = $state(false);
+	$effect(() => {
+		if (form?.error || form?.feedback?.success) {
+			feedbackOpen = true;
+		}
+	});
 	const currentYear = $derived(new Date(market.start_date).getFullYear());
 	const hasMultipleEditions = $derived(editions.length > 1);
 	const stateSlug = $derived(stateToSlug(market.state));
@@ -483,4 +492,54 @@
 			class="h-[300px]"
 		/>
 	</div>
+
+	<div
+		class="mt-8 flex flex-wrap items-center justify-end gap-3 border-t border-stone-200 pt-6 dark:border-stone-700"
+	>
+		<button
+			type="button"
+			onclick={() => (feedbackOpen = true)}
+			class="inline-flex items-center gap-1.5 text-sm font-medium text-stone-600 hover:text-stone-900 dark:text-stone-400 dark:hover:text-stone-100"
+		>
+			<svg class="h-4 w-4" fill="none" viewBox="0 0 24 24" stroke-width="1.5" stroke="currentColor">
+				<path
+					stroke-linecap="round"
+					stroke-linejoin="round"
+					d="M12 9v3.75m9-.75a9 9 0 11-18 0 9 9 0 0118 0zm-9 3.75h.008v.008H12v-.008z"
+				/>
+			</svg>
+			Falsche oder fehlende Angaben melden
+		</button>
+
+		{#if isAdmin}
+			<a
+				href="/admin/maerkte/{market.id}/bearbeiten"
+				class="inline-flex items-center gap-1.5 rounded-md border border-amber-400/60 bg-amber-50 px-2.5 py-1 text-sm font-medium text-amber-800 hover:bg-amber-100 dark:border-amber-500/40 dark:bg-amber-900/30 dark:text-amber-200 dark:hover:bg-amber-900/50"
+				title="Nur Admins sehen diesen Link"
+			>
+				<svg
+					class="h-4 w-4"
+					fill="none"
+					viewBox="0 0 24 24"
+					stroke-width="1.5"
+					stroke="currentColor"
+				>
+					<path
+						stroke-linecap="round"
+						stroke-linejoin="round"
+						d="M16.862 4.487l1.687-1.688a1.875 1.875 0 112.652 2.652L10.582 16.07a4.5 4.5 0 01-1.897 1.13L6 18l.8-2.685a4.5 4.5 0 011.13-1.897l8.932-8.931z"
+					/>
+				</svg>
+				Bearbeiten
+			</a>
+		{/if}
+	</div>
 </div>
+
+<MarketFeedbackDialog
+	open={feedbackOpen}
+	marketName={market.name}
+	turnstileSiteKey={data.turnstileSiteKey}
+	{form}
+	onClose={() => (feedbackOpen = false)}
+/>