diff --git a/frontend/css/app.css b/frontend/css/app.css
index 89e567b..cd1214b 100644
--- a/frontend/css/app.css
+++ b/frontend/css/app.css
@@ -616,6 +616,104 @@ a { color: var(--primary); text-decoration: none; }
 /* Day view specifics */
 .day-view .week-day-col { flex: 1; }
 
+/* ── Quarter View ───────────────────────────────────────── */
+.quarter-view {
+  display: flex;
+  gap: 16px;
+  padding: 16px;
+  height: 100%;
+  box-sizing: border-box;
+  overflow-y: auto;
+}
+.qtr-month {
+  flex: 1;
+  display: flex;
+  flex-direction: column;
+  min-width: 0;
+  background: var(--bg-2);
+  border: 1px solid var(--border);
+  border-radius: 8px;
+  overflow: hidden;
+}
+.qtr-month-name {
+  font-size: 13px;
+  font-weight: 600;
+  color: var(--text-1);
+  padding: 10px 12px 8px;
+  border-bottom: 1px solid var(--border);
+  letter-spacing: .3px;
+}
+.qtr-month-grid { padding: 6px 8px 8px; }
+.qtr-header {
+  display: grid;
+  grid-template-columns: repeat(7, 1fr);
+  margin-bottom: 2px;
+}
+.qtr-dow {
+  font-size: 10px;
+  font-weight: 600;
+  text-transform: uppercase;
+  color: var(--text-3);
+  text-align: center;
+  padding: 3px 0;
+}
+.qtr-cells {
+  display: grid;
+  grid-template-columns: repeat(7, 1fr);
+  grid-template-rows: repeat(6, auto);
+}
+.qtr-cell {
+  padding: 3px 2px;
+  text-align: center;
+  cursor: pointer;
+  border-radius: 4px;
+  min-height: 36px;
+}
+.qtr-cell:hover { background: var(--bg-hover); }
+.qtr-cell.today .qtr-day-num {
+  background: var(--today-color, var(--primary));
+  color: #fff;
+  border-radius: 50%;
+}
+.qtr-cell.selected .qtr-day-num {
+  background: var(--primary);
+  color: #fff;
+  border-radius: 50%;
+  opacity: .55;
+}
+.qtr-day-num {
+  font-size: 12px;
+  font-weight: 500;
+  color: var(--text-2);
+  width: 22px;
+  height: 22px;
+  line-height: 22px;
+  margin: 0 auto 2px;
+}
+.qtr-cell.other-month .qtr-day-num { color: var(--text-3); opacity: .45; }
+.qtr-cell.today .qtr-day-num { color: #fff; }
+.qtr-dots {
+  display: flex;
+  flex-wrap: wrap;
+  justify-content: center;
+  gap: 2px;
+  min-height: 6px;
+}
+.qtr-dot {
+  display: inline-block;
+  width: 6px;
+  height: 6px;
+  border-radius: 50%;
+  flex-shrink: 0;
+  cursor: pointer;
+}
+.qtr-dot.past { opacity: .45; }
+.qtr-dot-more {
+  font-size: 9px;
+  color: var(--text-3);
+  line-height: 6px;
+}
+
 /* ── Agenda View ────────────────────────────────────────── */
 .agenda-view { padding: 16px; }
 .agenda-day { margin-bottom: 16px; }
diff --git a/frontend/index.html b/frontend/index.html
index 480ebe7..291fad8 100644
--- a/frontend/index.html
+++ b/frontend/index.html
@@ -102,6 +102,7 @@
         <button class="view-btn" data-view="month" data-i18n="view_month">Monat</button>
         <button class="view-btn" data-view="week" data-i18n="view_week">Woche</button>
         <button class="view-btn" data-view="day" data-i18n="view_day">Tag</button>
+        <button class="view-btn" data-view="quarter" data-i18n="view_quarter">Quartal</button>
         <button class="view-btn" data-view="agenda" data-i18n="view_agenda">Termine</button>
       </div>
       <button class="icon-btn" id="btn-settings" data-i18n-title="settings_title" title="Einstellungen">
@@ -472,6 +473,7 @@
               <option value="month" data-i18n="view_month">Monat</option>
               <option value="week" data-i18n="view_week">Woche</option>
               <option value="day" data-i18n="view_day">Tag</option>
+              <option value="quarter" data-i18n="view_quarter">Quartal</option>
               <option value="agenda" data-i18n="view_agenda">Termine</option>
             </select>
           </div>
diff --git a/frontend/js/calendar.js b/frontend/js/calendar.js
index e177cb7..081145c 100644
--- a/frontend/js/calendar.js
+++ b/frontend/js/calendar.js
@@ -3,6 +3,7 @@ import { applyTheme, isToday, isSameDay, toLocalDatetimeInput, toDateInput, date
 import { renderMonth }  from './views/month.js';
 import { renderWeek }   from './views/week.js';
 import { renderAgenda } from './views/agenda.js';
+import { renderQuarter } from './views/quarter.js';
 import { openColorPicker } from './color-picker.js';
 import { openDatePicker, formatDtDisplay } from './date-picker.js';
 import { t, setLang, getLang } from './i18n.js';
@@ -193,6 +194,10 @@ function getViewRange() {
     start.setHours(0, 0, 0, 0);
     end = new Date(start);
     end.setDate(end.getDate() + 1);
+  } else if (state.currentView === 'quarter') {
+    const q = Math.floor(d.getMonth() / 3);
+    start = new Date(d.getFullYear(), q * 3, 1);
+    end   = new Date(d.getFullYear(), q * 3 + 3, 1);
   } else { // agenda
     start = new Date(d);
     start.setHours(0, 0, 0, 0);
@@ -232,6 +237,12 @@ function renderView() {
       weekStartDay,
       state.settings.hour_height || 60
     );
+  } else if (state.currentView === 'quarter') {
+    renderQuarter(container, state.currentDate, evs,
+      date => { state.currentDate = date; state.currentView = 'day'; updateViewButtons(); fetchAndRender(); },
+      showEventPopup,
+      weekStartDay
+    );
   } else {
     renderAgenda(container, state.currentDate, evs, showEventPopup);
   }
@@ -273,6 +284,9 @@ function updateTitle() {
       : `${mon.getDate()}. ${M[mon.getMonth()]} – ${sun.getDate()}. ${M[sun.getMonth()]} ${sun.getFullYear()}`;
   } else if (state.currentView === 'day') {
     title = `${d.getDate()}. ${M[d.getMonth()]} ${d.getFullYear()}`;
+  } else if (state.currentView === 'quarter') {
+    const q = Math.floor(d.getMonth() / 3) + 1;
+    title = `Q${q} ${d.getFullYear()}`;
   } else {
     title = `${d.getDate()}. ${M[d.getMonth()]} ${d.getFullYear()}`;
   }
@@ -610,6 +624,8 @@ function navigate(dir) {
   } else if (state.currentView === 'day') {
     state.currentDate = new Date(d);
     state.currentDate.setDate(d.getDate() + dir);
+  } else if (state.currentView === 'quarter') {
+    state.currentDate = new Date(d.getFullYear(), d.getMonth() + dir * 3, 1);
   } else {
     state.currentDate = new Date(d);
     state.currentDate.setDate(d.getDate() + dir * 30);
diff --git a/frontend/js/i18n.js b/frontend/js/i18n.js
index 283b3d3..b57c5dc 100644
--- a/frontend/js/i18n.js
+++ b/frontend/js/i18n.js
@@ -24,7 +24,7 @@ const translations = {
 
     // Topbar
     btn_today: 'Heute',
-    view_month: 'Monat', view_week: 'Woche', view_day: 'Tag', view_agenda: 'Termine',
+    view_month: 'Monat', view_week: 'Woche', view_day: 'Tag', view_quarter: 'Quartal', view_agenda: 'Termine',
     btn_profile: 'Profil', btn_logout: 'Abmelden',
 
     // Sidebar
@@ -218,7 +218,7 @@ const translations = {
 
     // Topbar
     btn_today: 'Today',
-    view_month: 'Month', view_week: 'Week', view_day: 'Day', view_agenda: 'Events',
+    view_month: 'Month', view_week: 'Week', view_day: 'Day', view_quarter: 'Quarter', view_agenda: 'Events',
     btn_profile: 'Profile', btn_logout: 'Log out',
 
     // Sidebar
diff --git a/frontend/js/views/quarter.js b/frontend/js/views/quarter.js
new file mode 100644
index 0000000..ffb0bcb
--- /dev/null
+++ b/frontend/js/views/quarter.js
@@ -0,0 +1,113 @@
+import { isToday, isSameDay, isPast, dayOfWeek, getISOWeekNumber } from '../utils.js';
+import { t } from '../i18n.js';
+
+export function renderQuarter(container, currentDate, events, onDayClick, onEventClick, weekStartDay = 'monday') {
+  const year = currentDate.getFullYear();
+  // Quarter: Q1=0, Q2=1, Q3=2, Q4=3
+  const quarter = Math.floor(currentDate.getMonth() / 3);
+  const firstMonthOfQ = quarter * 3;
+
+  // Build event map keyed by date string
+  const evMap = {};
+  events.forEach(ev => {
+    const s = new Date(ev.start);
+    const e = new Date(ev.end);
+    const cur = new Date(s);
+    cur.setHours(0, 0, 0, 0);
+    const endNorm = new Date(e);
+    endNorm.setHours(0, 0, 0, 0);
+    if (ev.allDay && endNorm > cur) endNorm.setDate(endNorm.getDate() - 1);
+    while (cur <= endNorm) {
+      const key = dateKey(cur);
+      if (!evMap[key]) evMap[key] = [];
+      evMap[key].push(ev);
+      cur.setDate(cur.getDate() + 1);
+    }
+  });
+
+  const DOW = weekStartDay === 'sunday' ? t('dow_sunday') : t('dow_monday');
+  const MONTHS = t('months');
+
+  const monthsHtml = [0, 1, 2].map(offset => {
+    const month = firstMonthOfQ + offset;
+    const firstDay = new Date(year, month, 1);
+    const lastDay  = new Date(year, month + 1, 0);
+
+    // Start grid on correct weekday
+    const gridStart = new Date(firstDay);
+    const startOffset = dayOfWeek(firstDay, weekStartDay);
+    gridStart.setDate(gridStart.getDate() - startOffset);
+
+    const cells = [];
+    const d = new Date(gridStart);
+    for (let i = 0; i < 42; i++) {
+      cells.push(new Date(d));
+      d.setDate(d.getDate() + 1);
+    }
+
+    // DOW header
+    const dowHeader = DOW.map(d => `<div class="qtr-dow">${d}</div>`).join('');
+
+    // Rows
+    let rowsHtml = '';
+    for (let row = 0; row < 6; row++) {
+      for (let col = 0; col < 7; col++) {
+        const cell = cells[row * 7 + col];
+        const key = dateKey(cell);
+        const cellEvs = evMap[key] || [];
+
+        const isOther   = cell.getMonth() !== month;
+        const todayCls  = isToday(cell)          ? 'today'    : '';
+        const otherCls  = isOther                ? 'other-month' : '';
+        const selCls    = isSameDay(cell, currentDate) && !isToday(cell) ? 'selected' : '';
+
+        // Up to 3 event dots
+        const dots = cellEvs.slice(0, 3).map(ev => {
+          const color = ev.color || ev.calendarColor || '#4285f4';
+          const pastCls = isPast(ev) ? 'past' : '';
+          return `<span class="qtr-dot ${pastCls}" style="background:${color}" title="${escAttr(ev.title)}" data-id="${ev.id}" data-url="${escAttr(ev.url || '')}"></span>`;
+        }).join('');
+        const moreDot = cellEvs.length > 3
+          ? `<span class="qtr-dot-more">+${cellEvs.length - 3}</span>`
+          : '';
+
+        rowsHtml += `<div class="qtr-cell ${todayCls} ${otherCls} ${selCls}" data-date="${key}">
+          <div class="qtr-day-num">${cell.getDate()}</div>
+          <div class="qtr-dots">${dots}${moreDot}</div>
+        </div>`;
+      }
+    }
+
+    return `<div class="qtr-month">
+      <div class="qtr-month-name">${MONTHS[month]}</div>
+      <div class="qtr-month-grid">
+        <div class="qtr-header">${dowHeader}</div>
+        <div class="qtr-cells">${rowsHtml}</div>
+      </div>
+    </div>`;
+  }).join('');
+
+  container.innerHTML = `<div class="quarter-view">${monthsHtml}</div>`;
+
+  // Click handlers
+  container.querySelectorAll('.qtr-cell').forEach(cell => {
+    cell.addEventListener('click', e => {
+      // Check if a dot was clicked
+      const dot = e.target.closest('.qtr-dot');
+      if (dot) {
+        e.stopPropagation();
+        const ev = events.find(ev => ev.id === dot.dataset.id && ev.url === dot.dataset.url);
+        if (ev) { onEventClick(ev, dot); return; }
+      }
+      onDayClick(new Date(cell.dataset.date + 'T00:00:00'));
+    });
+  });
+}
+
+function dateKey(d) {
+  return `${d.getFullYear()}-${String(d.getMonth()+1).padStart(2,'0')}-${String(d.getDate()).padStart(2,'0')}`;
+}
+
+function escAttr(s) {
+  return String(s).replace(/"/g,'&quot;').replace(/'/g,'&#39;');
+}