diff --git a/css/stylesheet_global.css b/css/stylesheet_global.css
index 4d0f4df..c650c64 100644
--- a/css/stylesheet_global.css
+++ b/css/stylesheet_global.css
@@ -597,6 +597,7 @@ label {
 }
 
 .category-item-profile {
+    position: relative;
     font-size: 1.25rem;
     font-weight: 400;
     line-height: 1;
@@ -651,6 +652,7 @@ label {
 }
 
 .profile-pill {
+    position: relative;
     width: 2.375rem;
     height: 2.375rem;
     border-radius: 1.1875rem;
@@ -666,6 +668,18 @@ label {
     text-decoration: none;
 }
 
+.notification-dot {
+    position: absolute;
+    top: -2px;
+    right: -2px;
+    width: 12px;
+    height: 12px;
+    background-color: var(--error);
+    border-radius: 50%;
+    border: 2px solid var(--butter-light);
+    z-index: 10;
+}
+
 /* Utilities */
 .text-center {
     text-align: center;
diff --git a/js/my_profil.js b/js/my_profil.js
index aa4d7d4..a4d1b9b 100644
--- a/js/my_profil.js
+++ b/js/my_profil.js
@@ -213,6 +213,11 @@
             const isActive = panel.getAttribute('data-profile-panel') === tabName;
             panel.classList.toggle('hidden', !isActive);
         });
+
+        if (tabName === 'teilnehmen') {
+            const registeredEvents = getMyRegisteredEvents(allEvents, currentUser);
+            markRegistrationsAsRead(registeredEvents);
+        }
     }
 
     // Reagiert auf Aktionen in der Liste "Meine Anmeldungen" per Event Delegation.
@@ -477,6 +482,35 @@
     }, 'hosting');
     }
 
+    function getSeenAddresses() {
+        try {
+            const raw = localStorage.getItem('socialCookingSeenAddresses');
+            return raw ? JSON.parse(raw) : [];
+        } catch (err) {
+            return [];
+        }
+    }
+
+    function markRegistrationsAsRead(events) {
+        const seen = getSeenAddresses();
+        let changed = false;
+        events.forEach(event => {
+            if (isAddressVisibleWindow(event) && !seen.includes(Number(event.id))) {
+                seen.push(Number(event.id));
+                changed = true;
+            }
+        });
+        if (changed) {
+            localStorage.setItem('socialCookingSeenAddresses', JSON.stringify(seen));
+            // Remove dots from UI
+            const tabDot = document.querySelector('[data-category-item="teilnehmen"] .notification-dot');
+            if (tabDot) tabDot.remove();
+            
+            const navDot = document.querySelector('.profile-pill .notification-dot');
+            if (navDot) navDot.remove();
+        }
+    }
+
     // Rendert angemeldete Events inkl. Zähler.
     function renderMyRegistrations(events, user) {
     const registeredEvents = getMyRegisteredEvents(events, user);
@@ -486,12 +520,37 @@
     myRegistrationsCount.textContent = String(count);
     if (myRegistrationsBtnCount) myRegistrationsBtnCount.textContent = String(count);
 
+    const seenAddresses = getSeenAddresses();
+    const unreadEvents = registeredEvents.filter(e => isAddressVisibleWindow(e) && !seenAddresses.includes(Number(e.id)));
+    const hasNotifications = unreadEvents.length > 0;
+
+    const tabButton = document.querySelector('[data-category-item="teilnehmen"]');
+    if (tabButton) {
+        let dot = tabButton.querySelector('.notification-dot');
+        if (hasNotifications) {
+            if (!dot) {
+                dot = document.createElement('span');
+                dot.className = 'notification-dot';
+                tabButton.appendChild(dot);
+            }
+        } else if (dot) {
+            dot.remove();
+        }
+    }
+
     renderEventCards(myRegistrationsList, registeredEvents, {
         title: 'Noch keine Anmeldungen',
         text: 'Entdecke spannende Dinner in deiner Naehe und melde dich direkt an.',
         buttonLabel: 'Events entdecken',
         href: 'event_overview.html'
-    }, 'registrations');
+    }, 'registrations', seenAddresses);
+
+    // Falls wir bereits auf dem Tab sind, direkt als gelesen markieren
+    const activeTab = document.querySelector('[data-category-item="teilnehmen"].is-active');
+    if (activeTab && hasNotifications) {
+        // Kurze Verzögerung, damit UI sich erst aufbaut
+        setTimeout(() => markRegistrationsAsRead(registeredEvents), 500);
+    }
     }
 
     // Gibt true zurück, wenn die Abmeldung gesperrt ist (innerhalb von 24h oder in der Vergangenheit).
@@ -505,7 +564,7 @@
     }
 
     // Baut die Eventkarten für beide Listen in einheitlichem Markup.
-    function renderEventCards(container, events, emptyStateConfig, mode) {
+    function renderEventCards(container, events, emptyStateConfig, mode, seenAddresses = []) {
         container.innerHTML = '';
 
         if (events.length === 0) {
diff --git a/js/navigation.js b/js/navigation.js
index 9206f87..2ac6878 100644
--- a/js/navigation.js
+++ b/js/navigation.js
@@ -6,6 +6,8 @@
 
 document.addEventListener('DOMContentLoaded', () => {
     const CURRENT_USER_KEY = 'socialCookingCurrentUser';
+    const REGISTRATION_STORAGE_KEY = 'socialCookingRegistrations';
+    const EVENTS_STORAGE_KEY = 'socialCookingEvents';
     const navcontainers = document.querySelectorAll('.nav-tab-links');
     const currentPage = (window.location.pathname.split('/').pop() || 'index.html').toLowerCase();
 
@@ -31,6 +33,93 @@ document.addEventListener('DOMContentLoaded', () => {
         window.location.href = 'index.html';
     };
 
+    // Hilfsfunktionen für Datumsberechnungen
+    function parseEventDateTime(event) {
+        if (!event?.date) return null;
+        const dateValue = String(event.date).trim();
+        const isoDateMatch = dateValue.match(/^(\d{4})-(\d{2})-(\d{2})$/);
+        let year, month, day;
+
+        if (isoDateMatch) {
+            year = Number(isoDateMatch[1]);
+            month = Number(isoDateMatch[2]);
+            day = Number(isoDateMatch[3]);
+        } else {
+            const monthMap = {
+                jan: 1, januar: 1,
+                feb: 2, februar: 2,
+                'mär': 3, mrz: 3, mar: 3, maerz: 3, märz: 3,
+                apr: 4, april: 4,
+                mai: 5,
+                jun: 6, juni: 6,
+                jul: 7, juli: 7,
+                aug: 8, august: 8,
+                sep: 9, sept: 9, september: 9,
+                okt: 10, oktober: 10,
+                nov: 11, november: 11,
+                dez: 12, dezember: 12
+            };
+            const localizedMatch = dateValue.match(/^(\d{1,2})\.\s*([A-Za-zÄÖÜäöü]{3,9})\.?\s*(\d{4})$/);
+            if (!localizedMatch) return null;
+            day = Number(localizedMatch[1]);
+            month = monthMap[String(localizedMatch[2]).toLowerCase()];
+            year = Number(localizedMatch[3]);
+            if (!month) return null;
+        }
+
+        const timeMatch = String(event.time || '').match(/(\d{1,2}):(\d{2})/);
+        const hours = timeMatch ? Number(timeMatch[1]) : 0;
+        const minutes = timeMatch ? Number(timeMatch[2]) : 0;
+        return new Date(year, month - 1, day, hours, minutes, 0, 0);
+    }
+
+    function isAddressVisibleWindow(event) {
+        const eventDateTime = parseEventDateTime(event);
+        if (!eventDateTime || Number.isNaN(eventDateTime.getTime())) return false;
+        const now = Date.now();
+        const start = eventDateTime.getTime();
+        const revealStart = start - (24 * 60 * 60 * 1000);
+        const revealEnd = start + (1 * 60 * 60 * 1000);
+        return now >= revealStart && now <= revealEnd;
+    }
+
+    async function hasUnreadNotifications(user) {
+        if (!user || !user.email) return false;
+        
+        let events = [];
+        try {
+            const rawStored = localStorage.getItem(EVENTS_STORAGE_KEY);
+            const storedEvents = rawStored ? JSON.parse(rawStored) : [];
+            
+            const response = await fetch('data/events.json');
+            const apiEvents = await response.json();
+            events = [...storedEvents, ...apiEvents];
+        } catch (err) {
+            console.error('Fehler beim Laden der Events für Benachrichtigungen', err);
+            return false;
+        }
+
+        let map = {};
+        try {
+            const rawReg = localStorage.getItem(REGISTRATION_STORAGE_KEY);
+            map = rawReg ? JSON.parse(rawReg) : {};
+        } catch (err) {}
+
+        let seenAddresses = [];
+        try {
+            const rawSeen = localStorage.getItem('socialCookingSeenAddresses');
+            seenAddresses = rawSeen ? JSON.parse(rawSeen) : [];
+        } catch (err) {}
+
+        const registeredIds = Array.isArray(map[user.email]) ? map[user.email] : [];
+        const idSet = new Set(registeredIds.map(id => Number(id)));
+
+        const myRegisteredEvents = events.filter(e => idSet.has(Number(e.id)));
+        
+        // Unread = address visible AND NOT marked as seen
+        return myRegisteredEvents.some(e => isAddressVisibleWindow(e) && !seenAddresses.includes(Number(e.id)));
+    }
+
     // Baut die Navigation für ausgeloggte Besucher.
     function buildLoggedOutNavigation() {
         const loginIsActive = currentPage === 'login.html';
@@ -71,10 +160,11 @@ document.addEventListener('DOMContentLoaded', () => {
     }
 
     // Baut die Navigation für eingeloggte Benutzer.
-    function buildLoggedInNavigation(user) {
+    function buildLoggedInNavigation(user, hasNotifications) {
         const initial = (user.vorname || 'U').charAt(0).toUpperCase();
         const isEventOverview = currentPage === 'event_overview.html';
         const isEventCreate = currentPage === 'event_create.html';
+        const notificationMarkup = hasNotifications ? '<span class="notification-dot"></span>' : '';
 
         return `
             <a
@@ -105,15 +195,27 @@ document.addEventListener('DOMContentLoaded', () => {
                 title="${user.vorname || 'Profil'}"
             >
                 ${initial}
+                ${notificationMarkup}
             </a>
         `;
     }
 
-    const currentUser = getCurrentUser();
-    const nextMarkup = currentUser ? buildLoggedInNavigation(currentUser) : buildLoggedOutNavigation();
+    async function initNavigation() {
+        const currentUser = getCurrentUser();
+        let nextMarkup;
 
-    // Wendet das passende Markup auf alle vorhandenen Kopf-Navigationen an.
-    navcontainers.forEach(container => {
-        container.innerHTML = nextMarkup;
-    });
+        if (currentUser) {
+            const hasNotifications = await hasUnreadNotifications(currentUser);
+            nextMarkup = buildLoggedInNavigation(currentUser, hasNotifications);
+        } else {
+            nextMarkup = buildLoggedOutNavigation();
+        }
+
+        // Wendet das passende Markup auf alle vorhandenen Kopf-Navigationen an.
+        navcontainers.forEach(container => {
+            container.innerHTML = nextMarkup;
+        });
+    }
+
+    initNavigation();
 });