diff --git a/backend/src/controllers/AdminController.cpp b/backend/src/controllers/AdminController.cpp
index eaa4305..0c1fa02 100644
--- a/backend/src/controllers/AdminController.cpp
+++ b/backend/src/controllers/AdminController.cpp
@@ -2336,6 +2336,41 @@ void AdminController::updateSiteSettings(const HttpRequestPtr &req,
                   };
     }
 
+    // Update announcement_enabled if provided
+    if (json->isMember("announcement_enabled")) {
+        bool enabled = (*json)["announcement_enabled"].asBool();
+        std::string value = enabled ? "true" : "false";
+        *dbClient << "INSERT INTO site_settings (setting_key, setting_value) VALUES ('announcement_enabled', $1) "
+                     "ON CONFLICT (setting_key) DO UPDATE SET setting_value = $1, updated_at = CURRENT_TIMESTAMP"
+                  << value
+                  >> [](const Result&) {
+                      LOG_INFO << "Announcement enabled setting updated successfully";
+                  }
+                  >> [](const DrogonDbException& e) {
+                      LOG_ERROR << "Failed to update announcement_enabled: " << e.base().what();
+                  };
+    }
+
+    // Update announcement_text if provided
+    if (json->isMember("announcement_text")) {
+        std::string text = (*json)["announcement_text"].asString();
+        // Limit to 500 characters
+        if (text.length() > 500) {
+            text = text.substr(0, 500);
+        }
+        // Sanitize to prevent XSS
+        text = htmlEscape(text);
+        *dbClient << "INSERT INTO site_settings (setting_key, setting_value) VALUES ('announcement_text', $1) "
+                     "ON CONFLICT (setting_key) DO UPDATE SET setting_value = $1, updated_at = CURRENT_TIMESTAMP"
+                  << text
+                  >> [](const Result&) {
+                      LOG_INFO << "Announcement text updated successfully";
+                  }
+                  >> [](const DrogonDbException& e) {
+                      LOG_ERROR << "Failed to update announcement_text: " << e.base().what();
+                  };
+    }
+
     // Update censored_words if provided (comma-separated list)
     if (json->isMember("censored_words")) {
         // Rate limit: 10 updates per minute per admin
@@ -2464,7 +2499,8 @@ void AdminController::getPublicSiteSettings(const HttpRequestPtr &,
               >> [callback](const Result& r) {
                   // Whitelist of publicly-safe settings
                   static const std::unordered_set<std::string> publicKeys = {
-                      "site_title", "logo_path", "logo_display_mode"
+                      "site_title", "logo_path", "logo_display_mode",
+                      "announcement_enabled", "announcement_text"
                   };
 
                   Json::Value resp;
diff --git a/database/init.sql b/database/init.sql
index 3875dba..9bb3864 100644
--- a/database/init.sql
+++ b/database/init.sql
@@ -555,7 +555,9 @@ CREATE TABLE IF NOT EXISTS site_settings (
 INSERT INTO site_settings (setting_key, setting_value) VALUES
     ('site_title', 'Stream'),
     ('logo_path', ''),
-    ('logo_display_mode', 'text')  -- 'text', 'image', 'both'
+    ('logo_display_mode', 'text'),  -- 'text', 'image', 'both'
+    ('announcement_enabled', 'false'),
+    ('announcement_text', '')
 ON CONFLICT (setting_key) DO NOTHING;
 
 -- Trigger for site_settings updated_at
diff --git a/frontend/src/lib/stores/siteSettings.js b/frontend/src/lib/stores/siteSettings.js
index 4dd91f4..4053420 100644
--- a/frontend/src/lib/stores/siteSettings.js
+++ b/frontend/src/lib/stores/siteSettings.js
@@ -3,5 +3,7 @@ import { writable } from 'svelte/store';
 export const siteSettings = writable({
     site_title: 'Stream',
     logo_path: '',
-    logo_display_mode: 'text'
+    logo_display_mode: 'text',
+    announcement_enabled: false,
+    announcement_text: ''
 });
diff --git a/frontend/src/routes/+layout.svelte b/frontend/src/routes/+layout.svelte
index ad7da15..34a4b4b 100644
--- a/frontend/src/routes/+layout.svelte
+++ b/frontend/src/routes/+layout.svelte
@@ -30,7 +30,9 @@
                 siteSettings.set({
                     site_title: settings.site_title || 'Stream',
                     logo_path: settings.logo_path || '',
-                    logo_display_mode: settings.logo_display_mode || 'text'
+                    logo_display_mode: settings.logo_display_mode || 'text',
+                    announcement_enabled: settings.announcement_enabled === 'true',
+                    announcement_text: settings.announcement_text || ''
                 });
             }
         } catch (e) {
@@ -413,6 +415,16 @@
     .dropdown-item.logout:hover :global(svg) {
         color: var(--error);
     }
+
+    .announcement-banner {
+        background: linear-gradient(135deg, #8b5cf6, #a855f7);
+        color: white;
+        padding: 0.75rem 1rem;
+        text-align: center;
+        font-size: 0.95rem;
+        font-weight: 500;
+        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
+    }
 </style>
 
 {#if !isPopoutPage}
@@ -559,6 +571,12 @@
     </div>
 </nav>
 
+{#if $siteSettings.announcement_enabled && $siteSettings.announcement_text}
+    <div class="announcement-banner">
+        {$siteSettings.announcement_text}
+    </div>
+{/if}
+
 {#if browser}
     <GlobalAudioPlayer />
     <ChatTerminal />
diff --git a/frontend/src/routes/admin/+page.svelte b/frontend/src/routes/admin/+page.svelte
index 34978f1..0836134 100644
--- a/frontend/src/routes/admin/+page.svelte
+++ b/frontend/src/routes/admin/+page.svelte
@@ -57,6 +57,11 @@
         lastRenewalError: null,
         autoRenewalEnabled: true
     };
+
+    // Announcement Settings
+    let announcementEnabled = false;
+    let announcementText = '';
+    let announcementSaving = false;
     let sslLoading = false;
     let sslSaving = false;
     let sslRequesting = false;
@@ -1142,6 +1147,8 @@
                     logo_display_mode: settings.logo_display_mode || 'text'
                 };
                 censoredWords = settings.censored_words || '';
+                announcementEnabled = settings.announcement_enabled === 'true';
+                announcementText = settings.announcement_text || '';
             } else {
                 console.error('Failed to load site settings');
             }
@@ -1221,6 +1228,35 @@
         setTimeout(() => { message = ''; error = ''; }, 3000);
     }
 
+    async function saveAnnouncementSettings() {
+        announcementSaving = true;
+        try {
+            const response = await fetch('/api/admin/settings/site', {
+                method: 'PUT',
+                credentials: 'include',
+                headers: {
+                    'Content-Type': 'application/json'
+                },
+                body: JSON.stringify({
+                    announcement_enabled: announcementEnabled,
+                    announcement_text: announcementText
+                })
+            });
+
+            if (response.ok) {
+                message = 'Announcement settings updated successfully';
+            } else {
+                error = 'Failed to update announcement settings';
+            }
+        } catch (e) {
+            error = 'Error updating announcement settings';
+            console.error(e);
+        }
+        announcementSaving = false;
+
+        setTimeout(() => { message = ''; error = ''; }, 3000);
+    }
+
     async function loadDefaultAvatars() {
         try {
             const response = await fetch('/api/admin/default-avatars', {
@@ -3603,6 +3639,57 @@
             {/if}
         </div>
 
+        <!-- Announcement Settings -->
+        <div class="card">
+            <h2>Site Announcement</h2>
+            <p style="color: var(--gray); margin-bottom: 2rem;">
+                Display a site-wide announcement banner at the top of all pages
+            </p>
+
+            <div style="display: grid; gap: 1.5rem; max-width: 600px;">
+                <div>
+                    <label style="display: flex; align-items: center; gap: 0.75rem; cursor: pointer;">
+                        <input
+                            type="checkbox"
+                            bind:checked={announcementEnabled}
+                            style="width: auto; margin: 0;"
+                        />
+                        <span>Enable announcement banner</span>
+                    </label>
+                    <small style="color: var(--gray); display: block; margin-top: 0.25rem; margin-left: 1.75rem;">
+                        When enabled, the announcement will be displayed at the top of all pages
+                    </small>
+                </div>
+
+                <div>
+                    <label for="announcementText">
+                        Announcement Message
+                    </label>
+                    <textarea
+                        id="announcementText"
+                        bind:value={announcementText}
+                        placeholder="Enter your announcement message here..."
+                        rows="3"
+                        maxlength="500"
+                        style="margin-top: 0.5rem; width: 100%; resize: vertical;"
+                    ></textarea>
+                    <small style="color: var(--gray); display: block; margin-top: 0.25rem;">
+                        {announcementText.length}/500 characters. This message will be displayed to all visitors.
+                    </small>
+                </div>
+
+                <div>
+                    <button
+                        class="btn btn-primary"
+                        on:click={saveAnnouncementSettings}
+                        disabled={announcementSaving}
+                    >
+                        {announcementSaving ? 'Saving...' : 'Save Announcement'}
+                    </button>
+                </div>
+            </div>
+        </div>
+
     {:else if activeTab === 'botkeys'}
         <div class="card">
             <h2>Bot API Keys</h2>