diff --git a/quotesdb/src/bin/ui/api.rs b/quotesdb/src/bin/ui/api.rs
index 30bd49f..01fb23b 100644
--- a/quotesdb/src/bin/ui/api.rs
+++ b/quotesdb/src/bin/ui/api.rs
@@ -343,6 +343,51 @@ pub async fn admin_unlock(admin_code: &str) -> Result<bool, ApiError> {
     }
 }
 
+/// Request body for `POST /api/quotes/:id/report`.
+#[derive(Serialize)]
+struct ReportBody {
+    /// Optional human-readable reason for the report (max 256 characters).
+    #[serde(skip_serializing_if = "Option::is_none")]
+    reason: Option<String>,
+    /// Cloudflare Turnstile CAPTCHA token obtained from the widget.
+    captcha_token: String,
+}
+
+/// Submit a report for a quote.
+///
+/// Posts `{ reason?, captcha_token }` to `POST /api/quotes/:id/report`.
+/// Returns `Ok(())` on HTTP 201. Returns [`ApiError::Server`] for other errors.
+///
+/// # Arguments
+/// - `id` — the quote's NanoID.
+/// - `reason` — optional user-provided reason text (max 256 characters).
+/// - `captcha_token` — Cloudflare Turnstile token from the solved CAPTCHA widget.
+pub async fn report_quote(
+    id: &str,
+    reason: Option<String>,
+    captcha_token: String,
+) -> Result<(), ApiError> {
+    let body = ReportBody {
+        reason,
+        captcha_token,
+    };
+    let resp = gloo::net::http::Request::post(&format!("/api/quotes/{id}/report"))
+        .json(&body)
+        .map_err(|e| ApiError::Network(e.to_string()))?
+        .send()
+        .await
+        .map_err(|e| ApiError::Network(e.to_string()))?;
+    if resp.status() == 201 {
+        Ok(())
+    } else {
+        let msg = resp.text().await.unwrap_or_default();
+        Err(ApiError::Server {
+            status: resp.status(),
+            message: msg,
+        })
+    }
+}
+
 /// Internal helper: GET a URL and deserialise the response body as JSON.
 ///
 /// Returns `ApiError` on non-2xx status or deserialisation failure.
diff --git a/quotesdb/src/bin/ui/components/mod.rs b/quotesdb/src/bin/ui/components/mod.rs
index 05f88eb..412ff88 100644
--- a/quotesdb/src/bin/ui/components/mod.rs
+++ b/quotesdb/src/bin/ui/components/mod.rs
@@ -6,3 +6,4 @@ pub mod auth_modal;
 pub mod error;
 pub mod pagination;
 pub mod quote_card;
+pub mod report_modal;
diff --git a/quotesdb/src/bin/ui/components/report_modal.rs b/quotesdb/src/bin/ui/components/report_modal.rs
new file mode 100644
index 0000000..de24e87
--- /dev/null
+++ b/quotesdb/src/bin/ui/components/report_modal.rs
@@ -0,0 +1,212 @@
+//! ReportModal component — lets users report a quote with an optional reason
+//! and a Cloudflare Turnstile CAPTCHA.
+//!
+//! The modal renders:
+//! - A textarea for an optional reason (max 256 characters, with a live counter).
+//! - A Cloudflare Turnstile widget that sets a hidden input once solved.
+//! - Submit (disabled until the CAPTCHA is solved) and Cancel buttons.
+//!
+//! Turnstile is loaded globally via the `<script>` tag in `index.html`.  After
+//! solving, Turnstile writes the token into a hidden `<input name="cf-turnstile-response">`.
+//! We read that value through the DOM on submit.
+
+use wasm_bindgen::JsCast;
+use web_sys::HtmlInputElement;
+use yew::prelude::*;
+
+/// Cloudflare Turnstile site key.
+///
+/// Replace with the real site key before going to production.
+/// `"0x4AAAAAAAAAAAAAAAAAAAAAA"` is the Turnstile always-passes test key.
+const TURNSTILE_SITE_KEY: &str = "0x4AAAAAAAAAAAAAAAAAAAAAA";
+
+/// Maximum allowed length for the optional report reason.
+const MAX_REASON_LEN: usize = 256;
+
+/// Props for the [`ReportModal`] component.
+#[derive(Properties, PartialEq)]
+pub struct ReportModalProps {
+    /// Callback invoked with `(reason, captcha_token)` when the user submits.
+    pub on_submit: Callback<(Option<String>, String)>,
+    /// Callback invoked when the user clicks Cancel.
+    pub on_cancel: Callback<()>,
+}
+
+/// Modal dialog for reporting a quote.
+///
+/// Renders a reason textarea, a Cloudflare Turnstile CAPTCHA widget, and
+/// Submit / Cancel buttons.  The Submit button is disabled until the Turnstile
+/// widget has been solved (i.e., the hidden input carries a non-empty token).
+///
+/// The Turnstile widget is rendered by injecting a `<div class="cf-turnstile">`
+/// with the appropriate `data-sitekey` attribute.  Turnstile's global JS (loaded
+/// in `index.html`) picks up that div automatically.
+///
+/// # Example
+///
+/// ```ignore
+/// html! {
+///     <ReportModal
+///         on_submit={Callback::from(|(reason, token)| { /* send to API */ })}
+///         on_cancel={Callback::from(|_| {})}
+///     />
+/// }
+/// ```
+#[function_component(ReportModal)]
+pub fn report_modal(props: &ReportModalProps) -> Html {
+    let reason = use_state(String::new);
+    // Whether the Turnstile CAPTCHA has been solved (token is non-empty).
+    let captcha_solved = use_state(|| false);
+
+    // --- Handle reason textarea input ---
+    let on_reason_input = {
+        let reason = reason.clone();
+        Callback::from(move |e: InputEvent| {
+            let textarea: web_sys::HtmlTextAreaElement = e.target_unchecked_into();
+            let mut val = textarea.value();
+            if val.len() > MAX_REASON_LEN {
+                val.truncate(MAX_REASON_LEN);
+            }
+            reason.set(val);
+        })
+    };
+
+    // --- Poll the hidden Turnstile input for a token on the "input" event ---
+    // Turnstile fires a synthetic "input" event on the hidden field when solved.
+    // We wire this up via use_effect so we can attach the listener to the DOM.
+    {
+        let captcha_solved = captcha_solved.clone();
+        use_effect(move || {
+            let window = web_sys::window().expect("no global window");
+            let document = window.document().expect("no document");
+
+            // Closure to check the hidden input value.
+            let captcha_solved_clone = captcha_solved.clone();
+            let check_fn = wasm_bindgen::closure::Closure::<dyn Fn()>::new(move || {
+                let document = web_sys::window()
+                    .and_then(|w| w.document())
+                    .expect("document");
+                if let Some(input_el) = document
+                    .query_selector("input[name='cf-turnstile-response']")
+                    .ok()
+                    .flatten()
+                {
+                    let input: HtmlInputElement = input_el.unchecked_into();
+                    captcha_solved_clone.set(!input.value().is_empty());
+                }
+            });
+
+            // Attach the listener to the document so it catches the event
+            // regardless of where Turnstile fires it.
+            let _ = document
+                .add_event_listener_with_callback("input", check_fn.as_ref().unchecked_ref());
+
+            // Also run once immediately in case the widget already solved
+            // (e.g., page revisit).
+            check_fn
+                .as_ref()
+                .unchecked_ref::<js_sys::Function>()
+                .call0(&wasm_bindgen::JsValue::NULL)
+                .ok();
+
+            // Keep the closure alive until the component unmounts.
+            check_fn.forget();
+            || ()
+        });
+    }
+
+    // --- Form submit handler ---
+    let on_submit = {
+        let reason = reason.clone();
+        let on_submit_cb = props.on_submit.clone();
+        Callback::from(move |e: SubmitEvent| {
+            e.prevent_default();
+
+            // Read the Turnstile token from the hidden input.
+            let token = web_sys::window()
+                .and_then(|w| w.document())
+                .and_then(|doc| {
+                    doc.query_selector("input[name='cf-turnstile-response']")
+                        .ok()
+                        .flatten()
+                })
+                .map(|el| el.unchecked_into::<HtmlInputElement>().value())
+                .unwrap_or_default();
+
+            if token.is_empty() {
+                return; // Should not happen — button is disabled until solved.
+            }
+
+            let reason_val = {
+                let s = (*reason).clone();
+                if s.is_empty() {
+                    None
+                } else {
+                    Some(s)
+                }
+            };
+
+            on_submit_cb.emit((reason_val, token));
+        })
+    };
+
+    let reason_len = reason.len();
+    let submit_disabled = !*captcha_solved;
+
+    let on_cancel = props.on_cancel.clone();
+
+    html! {
+        <div class="report-modal__overlay">
+            <div class="report-modal">
+                <h2 class="report-modal__title">{ "Report Quote" }</h2>
+                <p class="report-modal__desc">
+                    { "Use this form to report a quote that is inaccurate, offensive, or otherwise problematic." }
+                </p>
+                <form onsubmit={on_submit}>
+                    <div class="report-modal__field">
+                        <label class="report-modal__label">
+                            { "Reason (optional)" }
+                        </label>
+                        <textarea
+                            class="report-modal__textarea"
+                            placeholder="Describe the issue…"
+                            value={(*reason).clone()}
+                            oninput={on_reason_input}
+                            maxlength={(MAX_REASON_LEN as u32).to_string()}
+                        />
+                        <div class="report-modal__counter">
+                            { format!("{}/{}", reason_len, MAX_REASON_LEN) }
+                        </div>
+                    </div>
+
+                    // Turnstile renders itself into any div with class "cf-turnstile"
+                    // and the correct data-sitekey attribute.
+                    <div class="report-modal__captcha">
+                        <div
+                            class="cf-turnstile"
+                            data-sitekey={TURNSTILE_SITE_KEY}
+                            data-theme="light"
+                        />
+                    </div>
+
+                    <div class="report-modal__actions">
+                        <button
+                            type="submit"
+                            class="btn btn--danger"
+                            disabled={submit_disabled}
+                        >
+                            { "Submit Report" }
+                        </button>
+                        <button
+                            type="button"
+                            class="btn"
+                            onclick={Callback::from(move |_| on_cancel.emit(()))}
+                        >
+                            { "Cancel" }
+                        </button>
+                    </div>
+                </form>
+            </div>
+        </div>
+    }
+}
diff --git a/quotesdb/src/bin/ui/pages/quote.rs b/quotesdb/src/bin/ui/pages/quote.rs
index f9f4c0f..6932388 100644
--- a/quotesdb/src/bin/ui/pages/quote.rs
+++ b/quotesdb/src/bin/ui/pages/quote.rs
@@ -1,9 +1,10 @@
-//! Quote detail page — view, edit, and delete a single quote.
+//! Quote detail page — view, edit, delete, and report a single quote.
 
 use crate::api::{self, ApiError};
 use crate::components::auth_modal::AuthModal;
 use crate::components::error::ErrorDisplay;
 use crate::components::quote_card::QuoteCard;
+use crate::components::report_modal::ReportModal;
 use crate::{storage, Route};
 use quotesdb::{Quote, UpdateQuoteInput};
 use wasm_bindgen_futures::spawn_local;
@@ -22,6 +23,8 @@ enum Action {
     EditForm,
     /// Delete auth modal shown.
     DeleteAuth,
+    /// Report modal shown.
+    Report,
 }
 
 /// Props for the [`QuotePage`] component.
@@ -34,10 +37,11 @@ pub struct QuotePageProps {
 /// Quote detail page.
 ///
 /// Fetches a quote by ID, renders it with [`QuoteCard`], and provides
-/// Edit and Delete actions each guarded by the [`AuthModal`] component.
+/// Edit, Delete, and Report actions.
 ///
 /// - Edit: shows auth modal → edit form → `POST /api/quotes/:id` → re-fetch
 /// - Delete: shows auth modal → `DELETE /api/quotes/:id` → navigate to `/browse`
+/// - Report: shows [`ReportModal`] → `POST /api/quotes/:id/report` → success message
 /// - 403 errors clear the stored auth code and display an error message.
 /// - 404 errors display a user-friendly "not found" message.
 #[function_component(QuotePage)]
@@ -48,6 +52,7 @@ pub fn quote_page(props: &QuotePageProps) -> Html {
     let loading = use_state(|| true);
     let action = use_state(|| Action::None);
     let action_error: UseStateHandle<Option<String>> = use_state(|| None);
+    let report_success = use_state(|| false);
 
     // Edit form state — pre-filled from fetched quote
     let edit_text = use_state(String::new);
@@ -237,9 +242,38 @@ pub fn quote_page(props: &QuotePageProps) -> Html {
     let on_cancel = {
         let action = action.clone();
         let action_error = action_error.clone();
+        let report_success = report_success.clone();
         Callback::from(move |_| {
             action.set(Action::None);
             action_error.set(None);
+            report_success.set(false);
+        })
+    };
+
+    // --- Report modal submitted ---
+    let on_report_submit = {
+        let id = id.clone();
+        let action = action.clone();
+        let action_error = action_error.clone();
+        let report_success = report_success.clone();
+        Callback::from(move |(reason, captcha_token): (Option<String>, String)| {
+            let id = id.clone();
+            let action = action.clone();
+            let action_error = action_error.clone();
+            let report_success = report_success.clone();
+            spawn_local(async move {
+                match api::report_quote(&id, reason, captcha_token).await {
+                    Ok(()) => {
+                        report_success.set(true);
+                        action.set(Action::None);
+                        action_error.set(None);
+                    }
+                    Err(e) => {
+                        action_error.set(Some(format!("Report failed: {}", e)));
+                        action.set(Action::None);
+                    }
+                }
+            });
         })
     };
 
@@ -262,6 +296,12 @@ pub fn quote_page(props: &QuotePageProps) -> Html {
                     </div>
                 }
 
+                if *report_success {
+                    <div class="page-quote__report-success">
+                        { "Thank you — your report has been submitted." }
+                    </div>
+                }
+
                 if let Some(action_err) = (*action_error).clone() {
                     <ErrorDisplay message={action_err} />
                 }
@@ -299,6 +339,21 @@ pub fn quote_page(props: &QuotePageProps) -> Html {
                         >
                             { "Delete" }
                         </button>
+                        <button
+                            class="btn btn--muted"
+                            onclick={{
+                                let action = action.clone();
+                                let action_error = action_error.clone();
+                                let report_success = report_success.clone();
+                                Callback::from(move |_| {
+                                    action_error.set(None);
+                                    report_success.set(false);
+                                    action.set(Action::Report);
+                                })
+                            }}
+                        >
+                            { "Report" }
+                        </button>
                     </div>
                 }
 
@@ -414,6 +469,13 @@ pub fn quote_page(props: &QuotePageProps) -> Html {
                         prefill={storage::get_auth_code(&id)}
                     />
                 }
+
+                if *action == Action::Report {
+                    <ReportModal
+                        on_submit={on_report_submit}
+                        on_cancel={on_cancel.clone()}
+                    />
+                }
             } else {
                 <p>{ "Quote not found." }</p>
             }
diff --git a/quotesdb/src/bin/ui/style.css b/quotesdb/src/bin/ui/style.css
index d036afb..66e19b2 100644
--- a/quotesdb/src/bin/ui/style.css
+++ b/quotesdb/src/bin/ui/style.css
@@ -233,6 +233,17 @@ code {
   color: #ffffff;
 }
 
+.btn--muted {
+  background: var(--color-surface);
+  border-color: var(--color-border);
+  color: var(--color-text-muted);
+}
+
+.btn--muted:hover {
+  background: var(--color-bg);
+  color: var(--color-text);
+}
+
 /* ── QuoteCard ─────────────────────────────────────────────── */
 .quote-card {
   background: var(--color-surface);
@@ -350,6 +361,86 @@ code {
   color: var(--color-text-muted);
 }
 
+/* ── Report Modal ──────────────────────────────────────────── */
+.report-modal__overlay {
+  position: fixed;
+  inset: 0;
+  background: rgba(0, 0, 0, 0.5);
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  z-index: 1000;
+  padding: 1rem;
+}
+
+.report-modal {
+  background: var(--color-surface);
+  border-radius: var(--radius);
+  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
+  padding: 2rem;
+  width: 100%;
+  max-width: 480px;
+}
+
+.report-modal__title {
+  font-size: 1.25rem;
+  font-weight: 600;
+  margin-bottom: 0.5rem;
+}
+
+.report-modal__desc {
+  font-size: 0.9rem;
+  color: var(--color-text-muted);
+  margin-bottom: 1.25rem;
+}
+
+.report-modal__field {
+  margin-bottom: 1.25rem;
+}
+
+.report-modal__label {
+  display: block;
+  font-size: 0.875rem;
+  font-weight: 600;
+  margin-bottom: 0.4rem;
+  color: var(--color-text);
+}
+
+.report-modal__textarea {
+  width: 100%;
+  min-height: 5rem;
+}
+
+.report-modal__counter {
+  text-align: right;
+  font-size: 0.8rem;
+  color: var(--color-text-muted);
+  margin-top: 0.25rem;
+}
+
+.report-modal__captcha {
+  margin-bottom: 1.25rem;
+  display: flex;
+  justify-content: center;
+}
+
+.report-modal__actions {
+  display: flex;
+  gap: 0.75rem;
+  justify-content: flex-end;
+}
+
+/* ── Quote Detail — report success notice ──────────────────── */
+.page-quote__report-success {
+  background: #f0fdf4;
+  border: 1px solid #86efac;
+  border-radius: var(--radius);
+  padding: 0.875rem 1rem;
+  margin-bottom: 1rem;
+  color: var(--color-success);
+  font-size: 0.95rem;
+}
+
 /* ── Auth Modal ────────────────────────────────────────────── */
 .auth-modal__overlay {
   position: fixed;