diff --git a/app/web/api/alerts.py b/app/web/api/alerts.py
index 8315dae..18446d2 100644
--- a/app/web/api/alerts.py
+++ b/app/web/api/alerts.py
@@ -146,6 +146,47 @@ def acknowledge_alert(alert_id):
         }), 400
 
 
+@bp.route('/acknowledge-all', methods=['POST'])
+@api_auth_required
+def acknowledge_all_alerts():
+    """
+    Acknowledge all unacknowledged alerts.
+
+    Returns:
+        JSON response with count of acknowledged alerts
+    """
+    acknowledged_by = request.json.get('acknowledged_by', 'api') if request.json else 'api'
+
+    try:
+        # Get all unacknowledged alerts
+        unacked_alerts = current_app.db_session.query(Alert).filter(
+            Alert.acknowledged == False
+        ).all()
+
+        count = 0
+        for alert in unacked_alerts:
+            alert.acknowledged = True
+            alert.acknowledged_at = datetime.now(timezone.utc)
+            alert.acknowledged_by = acknowledged_by
+            count += 1
+
+        current_app.db_session.commit()
+
+        return jsonify({
+            'status': 'success',
+            'message': f'Acknowledged {count} alerts',
+            'count': count,
+            'acknowledged_by': acknowledged_by
+        })
+
+    except Exception as e:
+        current_app.db_session.rollback()
+        return jsonify({
+            'status': 'error',
+            'message': f'Failed to acknowledge alerts: {str(e)}'
+        }), 500
+
+
 @bp.route('/rules', methods=['GET'])
 @api_auth_required
 def list_alert_rules():
diff --git a/app/web/templates/alerts.html b/app/web/templates/alerts.html
index 4d71640..b6fe6ab 100644
--- a/app/web/templates/alerts.html
+++ b/app/web/templates/alerts.html
@@ -6,9 +6,14 @@
 <div class="row mt-4">
     <div class="col-12 d-flex justify-content-between align-items-center mb-4">
         <h1>Alert History</h1>
-        <a href="{{ url_for('main.alert_rules') }}" class="btn btn-primary">
-            <i class="bi bi-gear"></i> Manage Alert Rules
-        </a>
+        <div>
+            <button class="btn btn-success me-2" onclick="acknowledgeAllAlerts()">
+                <i class="bi bi-check-all"></i> Ack All
+            </button>
+            <a href="{{ url_for('main.alert_rules') }}" class="btn btn-primary">
+                <i class="bi bi-gear"></i> Manage Alert Rules
+            </a>
+        </div>
     </div>
 </div>
 
@@ -265,5 +270,34 @@ function acknowledgeAlert(alertId) {
         alert('Failed to acknowledge alert');
     });
 }
+
+function acknowledgeAllAlerts() {
+    if (!confirm('Acknowledge all unacknowledged alerts?')) {
+        return;
+    }
+
+    fetch('/api/alerts/acknowledge-all', {
+        method: 'POST',
+        headers: {
+            'Content-Type': 'application/json',
+            'X-API-Key': localStorage.getItem('api_key') || ''
+        },
+        body: JSON.stringify({
+            acknowledged_by: 'web_user'
+        })
+    })
+    .then(response => response.json())
+    .then(data => {
+        if (data.status === 'success') {
+            location.reload();
+        } else {
+            alert('Failed to acknowledge alerts: ' + (data.message || 'Unknown error'));
+        }
+    })
+    .catch(error => {
+        console.error('Error:', error);
+        alert('Failed to acknowledge alerts');
+    });
+}
 </script>
 {% endblock %}
\ No newline at end of file