diff --git a/apps/dav/appinfo/info.xml b/apps/dav/appinfo/info.xml
index 0136e86ba3e7d..9d1429471d35f 100644
--- a/apps/dav/appinfo/info.xml
+++ b/apps/dav/appinfo/info.xml
@@ -10,7 +10,7 @@
 	<name>WebDAV</name>
 	<summary>WebDAV endpoint</summary>
 	<description>WebDAV endpoint</description>
-	<version>3.0.0-dev.0</version>
+	<version>3.0.0-dev.1</version>
 	<licence>agpl</licence>
 	<author>owncloud.org</author>
 	<namespace>DAV</namespace>
diff --git a/apps/dav/composer/composer/autoload_classmap.php b/apps/dav/composer/composer/autoload_classmap.php
index fbe1e27bbc5c4..310f1ec83be3d 100644
--- a/apps/dav/composer/composer/autoload_classmap.php
+++ b/apps/dav/composer/composer/autoload_classmap.php
@@ -415,6 +415,7 @@
     'OCA\\DAV\\Migration\\Version1038Date20260302000000' => $baseDir . '/../lib/Migration/Version1038Date20260302000000.php',
     'OCA\\DAV\\Migration\\Version1039Date20260408000000' => $baseDir . '/../lib/Migration/Version1039Date20260408000000.php',
     'OCA\\DAV\\Migration\\Version1040Date20260805000000' => $baseDir . '/../lib/Migration/Version1040Date20260805000000.php',
+    'OCA\\DAV\\Migration\\Version3000Date20260828000000' => $baseDir . '/../lib/Migration/Version3000Date20260828000000.php',
     'OCA\\DAV\\Model\\ExampleEvent' => $baseDir . '/../lib/Model/ExampleEvent.php',
     'OCA\\DAV\\Paginate\\LimitedCopyIterator' => $baseDir . '/../lib/Paginate/LimitedCopyIterator.php',
     'OCA\\DAV\\Paginate\\PaginateCache' => $baseDir . '/../lib/Paginate/PaginateCache.php',
diff --git a/apps/dav/composer/composer/autoload_static.php b/apps/dav/composer/composer/autoload_static.php
index 5e0385de4eddc..98a49d46284dd 100644
--- a/apps/dav/composer/composer/autoload_static.php
+++ b/apps/dav/composer/composer/autoload_static.php
@@ -430,6 +430,7 @@ class ComposerStaticInitDAV
         'OCA\\DAV\\Migration\\Version1038Date20260302000000' => __DIR__ . '/..' . '/../lib/Migration/Version1038Date20260302000000.php',
         'OCA\\DAV\\Migration\\Version1039Date20260408000000' => __DIR__ . '/..' . '/../lib/Migration/Version1039Date20260408000000.php',
         'OCA\\DAV\\Migration\\Version1040Date20260805000000' => __DIR__ . '/..' . '/../lib/Migration/Version1040Date20260805000000.php',
+        'OCA\\DAV\\Migration\\Version3000Date20260828000000' => __DIR__ . '/..' . '/../lib/Migration/Version3000Date20260828000000.php',
         'OCA\\DAV\\Model\\ExampleEvent' => __DIR__ . '/..' . '/../lib/Model/ExampleEvent.php',
         'OCA\\DAV\\Paginate\\LimitedCopyIterator' => __DIR__ . '/..' . '/../lib/Paginate/LimitedCopyIterator.php',
         'OCA\\DAV\\Paginate\\PaginateCache' => __DIR__ . '/..' . '/../lib/Paginate/PaginateCache.php',
diff --git a/apps/dav/lib/CalDAV/CalDavBackend.php b/apps/dav/lib/CalDAV/CalDavBackend.php
index b3b9ebf4238bd..c6e8c9c54f497 100644
--- a/apps/dav/lib/CalDAV/CalDavBackend.php
+++ b/apps/dav/lib/CalDAV/CalDavBackend.php
@@ -153,6 +153,7 @@ class CalDavBackend extends AbstractBackend implements SyncSupport, Subscription
 		'{' . \OCA\DAV\DAV\Sharing\Plugin::NS_NEXTCLOUD . '}deleted-at' => ['deleted_at', 'int'],
 		'{' . \OCA\DAV\DAV\Sharing\Plugin::NS_NEXTCLOUD . '}default-alarm-part-day' => ['default_alarm_pday', 'int'],
 		'{' . \OCA\DAV\DAV\Sharing\Plugin::NS_NEXTCLOUD . '}default-alarm-full-day' => ['default_alarm_fday', 'int'],
+		'{' . \OCA\DAV\DAV\Sharing\Plugin::NS_NEXTCLOUD . '}disable-alarm-notifications' => ['disable_alarm_notifications', 'bool'],
 	];
 
 	/**
diff --git a/apps/dav/lib/CalDAV/Reminder/Backend.php b/apps/dav/lib/CalDAV/Reminder/Backend.php
index 5ea4566fa4c36..8f5e47cb8ab04 100644
--- a/apps/dav/lib/CalDAV/Reminder/Backend.php
+++ b/apps/dav/lib/CalDAV/Reminder/Backend.php
@@ -9,8 +9,11 @@
 
 namespace OCA\DAV\CalDAV\Reminder;
 
+use OCA\DAV\DAV\Sharing\Plugin;
+use OCA\DAV\Db\PropertyMapper;
 use OCP\AppFramework\Utility\ITimeFactory;
 use OCP\IDBConnection;
+use Sabre\Uri;
 
 /**
  * Class Backend
@@ -19,15 +22,23 @@
  */
 class Backend {
 
+	/**
+	 * WebDAV property a sharee sets on their own view of a shared calendar
+	 * to mute reminders, stored via the generic custom-properties backend.
+	 */
+	private const string PROPERTY_DISABLE_ALARM_NOTIFICATIONS = '{' . Plugin::NS_NEXTCLOUD . '}disable-alarm-notifications';
+
 	/**
 	 * Backend constructor.
 	 *
 	 * @param IDBConnection $db
 	 * @param ITimeFactory $timeFactory
+	 * @param PropertyMapper $propertyMapper
 	 */
 	public function __construct(
 		protected IDBConnection $db,
 		protected ITimeFactory $timeFactory,
+		private PropertyMapper $propertyMapper,
 	) {
 	}
 
@@ -39,12 +50,12 @@ public function __construct(
 	 */
 	public function getRemindersToProcess():array {
 		$query = $this->db->getQueryBuilder();
-		$query->select(['cr.id', 'cr.calendar_id','cr.object_id','cr.is_recurring','cr.uid','cr.recurrence_id','cr.is_recurrence_exception','cr.event_hash','cr.alarm_hash','cr.type','cr.is_relative','cr.notification_date','cr.is_repeat_based','co.calendardata', 'c.displayname', 'c.principaluri'])
+		$query->select(['cr.id', 'cr.calendar_id','cr.object_id','cr.is_recurring','cr.uid','cr.recurrence_id','cr.is_recurrence_exception','cr.event_hash','cr.alarm_hash','cr.type','cr.is_relative','cr.notification_date','cr.is_repeat_based','co.calendardata', 'c.displayname', 'c.principaluri', 'c.uri', 'c.disable_alarm_notifications'])
 			->from('calendar_reminders', 'cr')
 			->where($query->expr()->lte('cr.notification_date', $query->createNamedParameter($this->timeFactory->getTime())))
 			->join('cr', 'calendarobjects', 'co', $query->expr()->eq('cr.object_id', 'co.id'))
 			->join('cr', 'calendars', 'c', $query->expr()->eq('cr.calendar_id', 'c.id'))
-			->groupBy('cr.event_hash', 'cr.notification_date', 'cr.type', 'cr.id', 'cr.calendar_id', 'cr.object_id', 'cr.is_recurring', 'cr.uid', 'cr.recurrence_id', 'cr.is_recurrence_exception', 'cr.alarm_hash', 'cr.is_relative', 'cr.is_repeat_based', 'co.calendardata', 'c.displayname', 'c.principaluri');
+			->groupBy('cr.event_hash', 'cr.notification_date', 'cr.type', 'cr.id', 'cr.calendar_id', 'cr.object_id', 'cr.is_recurring', 'cr.uid', 'cr.recurrence_id', 'cr.is_recurrence_exception', 'cr.alarm_hash', 'cr.is_relative', 'cr.is_repeat_based', 'co.calendardata', 'c.displayname', 'c.principaluri', 'c.uri', 'c.disable_alarm_notifications');
 		$stmt = $query->executeQuery();
 
 		return array_map(
@@ -53,6 +64,35 @@ public function getRemindersToProcess():array {
 		);
 	}
 
+	/**
+	 * Whether the given principal has muted reminders for this reminder's calendar.
+	 *
+	 * The calendar owner's setting is stored directly on the `calendars` row (already
+	 * part of $reminder). A sharee's setting is their own WebDAV property on their view
+	 * of the shared calendar, stored via the generic custom-properties backend.
+	 *
+	 * @param array $reminder A row as returned by getRemindersToProcess()
+	 */
+	public function isReminderMutedForPrincipal(array $reminder, string $principalUri): bool {
+		if ($principalUri === $reminder['principaluri']) {
+			return $reminder['disable_alarm_notifications'];
+		}
+
+		[, $shareeUid] = Uri\split($principalUri);
+		[, $ownerUid] = Uri\split($reminder['principaluri']);
+		if ($shareeUid === null || $ownerUid === null) {
+			return false;
+		}
+
+		$path = 'calendars/' . $shareeUid . '/' . $reminder['uri'] . '_shared_by_' . $ownerUid;
+		$properties = $this->propertyMapper->findPropertyByPathAndName($shareeUid, $path, self::PROPERTY_DISABLE_ALARM_NOTIFICATIONS);
+		if (empty($properties)) {
+			return false;
+		}
+
+		return $properties[0]->getPropertyvalue() === '1';
+	}
+
 	/**
 	 * Get all scheduled reminders for an event
 	 *
@@ -192,6 +232,9 @@ private function fixRowTyping(array $row): array {
 		$row['is_relative'] = (bool)$row['is_relative'];
 		$row['notification_date'] = (int)$row['notification_date'];
 		$row['is_repeat_based'] = (bool)$row['is_repeat_based'];
+		if (array_key_exists('disable_alarm_notifications', $row)) {
+			$row['disable_alarm_notifications'] = (bool)$row['disable_alarm_notifications'];
+		}
 
 		return $row;
 	}
diff --git a/apps/dav/lib/CalDAV/Reminder/ReminderService.php b/apps/dav/lib/CalDAV/Reminder/ReminderService.php
index ef480a310b2b6..bc163fb9815ed 100644
--- a/apps/dav/lib/CalDAV/Reminder/ReminderService.php
+++ b/apps/dav/lib/CalDAV/Reminder/ReminderService.php
@@ -123,15 +123,30 @@ public function processReminders() :void {
 				continue;
 			}
 
-			if ($this->config->getAppValue('dav', 'sendEventRemindersToSharedUsers', 'yes') === 'no') {
+			if ($this->config->getAppValue('dav', 'sendEventRemindersToSharedUsers', 'yes') === 'yes') {
 				$users = $this->getAllUsersWithWriteAccessToCalendar($reminder['calendar_id']);
 			} else {
 				$users = [];
 			}
 
-			$user = $this->getUserFromPrincipalURI($reminder['principaluri']);
-			if ($user) {
-				$users[] = $user;
+			$ownerUser = $this->getUserFromPrincipalURI($reminder['principaluri']);
+			if ($ownerUser !== null) {
+				$users[] = $ownerUser;
+			}
+
+			// Filter out any users who have muted reminders for this calendar
+			$users = array_values(array_filter($users, function (IUser $u) use ($reminder): bool {
+				$principalUri = 'principals/users/' . $u->getUID();
+				return !$this->backend->isReminderMutedForPrincipal($reminder, $principalUri);
+			}));
+
+			if (count($users) === 0) {
+				$this->logger->debug('Reminder {id} is ignored by all recipient users for calendar {calendarId}', [
+					'id' => $reminder['id'],
+					'calendarId' => $reminder['calendar_id'],
+				]);
+				$this->deleteOrProcessNext($reminder, $vevent);
+				continue;
 			}
 
 			$userPrincipalEmailAddresses = [];
diff --git a/apps/dav/lib/DAV/CustomPropertiesBackend.php b/apps/dav/lib/DAV/CustomPropertiesBackend.php
index 3a95fe07606ca..101132f1c3d5e 100644
--- a/apps/dav/lib/DAV/CustomPropertiesBackend.php
+++ b/apps/dav/lib/DAV/CustomPropertiesBackend.php
@@ -195,6 +195,7 @@ public function propFind($path, PropFind $propFind): void {
 				'{http://apple.com/ns/ical/}calendar-order',
 				'{http://apple.com/ns/ical/}calendar-color',
 				'{urn:ietf:params:xml:ns:caldav}schedule-calendar-transp',
+				'{http://nextcloud.com/ns}disable-alarm-notifications',
 			];
 
 			foreach ($customPropertiesForShares as $customPropertyForShares) {
diff --git a/apps/dav/lib/Migration/Version3000Date20260828000000.php b/apps/dav/lib/Migration/Version3000Date20260828000000.php
new file mode 100644
index 0000000000000..4d53ede02bd1a
--- /dev/null
+++ b/apps/dav/lib/Migration/Version3000Date20260828000000.php
@@ -0,0 +1,40 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2026 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OCA\DAV\Migration;
+
+use Closure;
+use OCP\DB\ISchemaWrapper;
+use OCP\DB\Types;
+use OCP\Migration\Attributes\AddColumn;
+use OCP\Migration\Attributes\ColumnType;
+use OCP\Migration\IOutput;
+use OCP\Migration\SimpleMigrationStep;
+use Override;
+
+#[AddColumn(table: 'calendars', name: 'disable_alarm_notifications', type: ColumnType::BOOLEAN)]
+class Version3000Date20260828000000 extends SimpleMigrationStep {
+	#[Override]
+	public function changeSchema(IOutput $output, Closure $schemaClosure, array $options): ?ISchemaWrapper {
+		/** @var ISchemaWrapper $schema */
+		$schema = $schemaClosure();
+		$modified = false;
+
+		$calendarsTable = $schema->getTable('calendars');
+		if (!$calendarsTable->hasColumn('disable_alarm_notifications')) {
+			$calendarsTable->addColumn('disable_alarm_notifications', Types::BOOLEAN, [
+				'notnull' => false,
+				'default' => false,
+			]);
+			$modified = true;
+		}
+		
+		return $modified ? $schema : null;
+	}
+}
diff --git a/apps/dav/tests/unit/CalDAV/CalDavBackendTest.php b/apps/dav/tests/unit/CalDAV/CalDavBackendTest.php
index a45ee73cd2e06..6fee8f696fd6f 100644
--- a/apps/dav/tests/unit/CalDAV/CalDavBackendTest.php
+++ b/apps/dav/tests/unit/CalDAV/CalDavBackendTest.php
@@ -2478,4 +2478,35 @@ public function testGetFederatedCalendarByUriHidesPendingCalendar(): void {
 
 		$this->assertNull($this->backend->getFederatedCalendarByUri(self::UNIT_TEST_USER, 'federated-cal'));
 	}
+
+	public function testDisableAlarmNotificationsProperty(): void {
+		$calendarId = $this->backend->createCalendar(self::UNIT_TEST_USER, 'DisableAlarmNotificationsTest', []);
+
+		// Default should be false
+		$calendars = $this->backend->getCalendarsForUser(self::UNIT_TEST_USER);
+		$this->assertFalse((bool)($calendars[0]['{http://nextcloud.com/ns}disable-alarm-notifications'] ?? false));
+
+		// Update to true ('1')
+		$patch = new PropPatch([
+			'{http://nextcloud.com/ns}disable-alarm-notifications' => '1',
+		]);
+		$this->backend->updateCalendar($calendarId, $patch);
+		$patch->commit();
+
+		$calendars = $this->backend->getCalendarsForUser(self::UNIT_TEST_USER);
+		$this->assertTrue((bool)($calendars[0]['{http://nextcloud.com/ns}disable-alarm-notifications'] ?? false));
+
+		// Update to false ('0')
+		$patch = new PropPatch([
+			'{http://nextcloud.com/ns}disable-alarm-notifications' => '0',
+		]);
+		$this->backend->updateCalendar($calendarId, $patch);
+		$patch->commit();
+
+		$calendars = $this->backend->getCalendarsForUser(self::UNIT_TEST_USER);
+		$this->assertFalse((bool)($calendars[0]['{http://nextcloud.com/ns}disable-alarm-notifications'] ?? false));
+
+		// Clean up
+		$this->backend->deleteCalendar($calendars[0]['id'], true);
+	}
 }
diff --git a/apps/dav/tests/unit/CalDAV/Reminder/BackendTest.php b/apps/dav/tests/unit/CalDAV/Reminder/BackendTest.php
index f29b88c5085da..59c55d9bbb3cd 100644
--- a/apps/dav/tests/unit/CalDAV/Reminder/BackendTest.php
+++ b/apps/dav/tests/unit/CalDAV/Reminder/BackendTest.php
@@ -10,7 +10,9 @@
 namespace OCA\DAV\Tests\unit\CalDAV\Reminder;
 
 use OCA\DAV\CalDAV\Reminder\Backend as ReminderBackend;
+use OCA\DAV\Db\PropertyMapper;
 use OCP\AppFramework\Utility\ITimeFactory;
+use OCP\DB\QueryBuilder\IQueryBuilder;
 use PHPUnit\Framework\MockObject\MockObject;
 use Test\TestCase;
 
@@ -25,9 +27,10 @@ protected function setUp(): void {
 		$query->delete('calendar_reminders')->executeStatement();
 		$query->delete('calendarobjects')->executeStatement();
 		$query->delete('calendars')->executeStatement();
+		$query->delete('properties')->executeStatement();
 
 		$this->timeFactory = $this->createMock(ITimeFactory::class);
-		$this->reminderBackend = new ReminderBackend(self::$realDatabase, $this->timeFactory);
+		$this->reminderBackend = new ReminderBackend(self::$realDatabase, $this->timeFactory, new PropertyMapper(self::$realDatabase));
 
 		$this->createRemindersTestSet();
 	}
@@ -37,6 +40,7 @@ protected function tearDown(): void {
 		$query->delete('calendar_reminders')->executeStatement();
 		$query->delete('calendarobjects')->executeStatement();
 		$query->delete('calendars')->executeStatement();
+		$query->delete('properties')->executeStatement();
 
 		parent::tearDown();
 	}
@@ -129,6 +133,8 @@ public function testGetRemindersToProcess(): void {
 			'calendardata' => 'Calendar data 123',
 			'displayname' => 'Displayname 123',
 			'principaluri' => 'principals/users/user001',
+			'uri' => 'personal',
+			'disable_alarm_notifications' => false,
 		];
 		$expected2 = [
 			'calendar_id' => 1,
@@ -146,6 +152,8 @@ public function testGetRemindersToProcess(): void {
 			'calendardata' => 'Calendar data 123',
 			'displayname' => 'Displayname 123',
 			'principaluri' => 'principals/users/user001',
+			'uri' => 'personal',
+			'disable_alarm_notifications' => false,
 		];
 
 		$this->assertEqualsCanonicalizing([$rows[0],$rows[1]], [$expected1,$expected2]);
@@ -252,6 +260,50 @@ public function testUpdateReminder(): void {
 		$this->assertEquals((int)$row['notification_date'], 123700);
 	}
 
+	public function testIsReminderMutedForPrincipalUsesCalendarColumnForOwner(): void {
+		$reminder = [
+			'principaluri' => 'principals/users/user001',
+			'uri' => 'personal',
+			'disable_alarm_notifications' => true,
+		];
+
+		$this->assertTrue($this->reminderBackend->isReminderMutedForPrincipal($reminder, 'principals/users/user001'));
+	}
+
+	public function testIsReminderMutedForPrincipalIsFalseForShareeWithoutProperty(): void {
+		$reminder = [
+			'principaluri' => 'principals/users/user001',
+			'uri' => 'personal',
+			'disable_alarm_notifications' => false,
+		];
+
+		$this->assertFalse($this->reminderBackend->isReminderMutedForPrincipal($reminder, 'principals/users/user002'));
+	}
+
+	public function testIsReminderMutedForPrincipalReadsShareePropertyOverride(): void {
+		$reminder = [
+			'principaluri' => 'principals/users/user001',
+			'uri' => 'personal',
+			// Owner has not muted their own calendar ...
+			'disable_alarm_notifications' => false,
+		];
+		// ... but the sharee muted their own view of it.
+		$path = 'calendars/user002/personal_shared_by_user001';
+
+		$query = self::$realDatabase->getQueryBuilder();
+		$query->insert('properties')
+			->values([
+				'userid' => $query->createNamedParameter('user002'),
+				'propertypath' => $query->createNamedParameter($path),
+				'propertyname' => $query->createNamedParameter('{http://nextcloud.com/ns}disable-alarm-notifications'),
+				'propertyvalue' => $query->createNamedParameter('1'),
+				'valuetype' => $query->createNamedParameter(1, IQueryBuilder::PARAM_INT),
+			])
+			->executeStatement();
+
+		$this->assertTrue($this->reminderBackend->isReminderMutedForPrincipal($reminder, 'principals/users/user002'));
+	}
+
 	private function createRemindersTestSet(): void {
 		$query = self::$realDatabase->getQueryBuilder();
 		$query->insert('calendars')
@@ -259,6 +311,7 @@ private function createRemindersTestSet(): void {
 				'id' => $query->createNamedParameter(1),
 				'principaluri' => $query->createNamedParameter('principals/users/user001'),
 				'displayname' => $query->createNamedParameter('Displayname 123'),
+				'uri' => $query->createNamedParameter('personal'),
 			])
 			->executeStatement();
 
@@ -268,6 +321,7 @@ private function createRemindersTestSet(): void {
 				'id' => $query->createNamedParameter(99),
 				'principaluri' => $query->createNamedParameter('principals/users/user002'),
 				'displayname' => $query->createNamedParameter('Displayname 99'),
+				'uri' => $query->createNamedParameter('personal'),
 			])
 			->executeStatement();
 
diff --git a/apps/dav/tests/unit/CalDAV/Reminder/ReminderServiceTest.php b/apps/dav/tests/unit/CalDAV/Reminder/ReminderServiceTest.php
index f07d508e61978..0fde892b53dba 100644
--- a/apps/dav/tests/unit/CalDAV/Reminder/ReminderServiceTest.php
+++ b/apps/dav/tests/unit/CalDAV/Reminder/ReminderServiceTest.php
@@ -774,4 +774,55 @@ public function testProcessReminders():void {
 
 		$this->reminderService->processReminders();
 	}
+
+	public function testProcessRemindersSkipsMutedRecipient():void {
+		$reminder = [
+			'id' => 1,
+			'calendar_id' => 1337,
+			'object_id' => 42,
+			'uid' => 'wej2z68l9h',
+			'is_recurring' => false,
+			'recurrence_id' => 1465430400,
+			'is_recurrence_exception' => false,
+			'event_hash' => '5c70531aab15c92b52518ae10a2f78a4',
+			'alarm_hash' => 'de919af7429d3b5c11e8b9d289b411a6',
+			'type' => 'EMAIL',
+			'is_relative' => true,
+			'notification_date' => 1465429500,
+			'is_repeat_based' => false,
+			'calendardata' => self::CALENDAR_DATA,
+			'displayname' => 'Displayname 123',
+			'principaluri' => 'principals/users/user001',
+		];
+
+		$this->backend->expects($this->once())
+			->method('getRemindersToProcess')
+			->willReturn([$reminder]);
+
+		$this->notificationProviderManager->expects($this->once())
+			->method('hasProvider')
+			->with('EMAIL')
+			->willReturn(true);
+
+		$user = $this->createMock(IUser::class);
+		$user->method('getUID')->willReturn('user001');
+		$this->userManager->expects($this->once())
+			->method('get')
+			->with('user001')
+			->willReturn($user);
+
+		$this->backend->expects($this->once())
+			->method('isReminderMutedForPrincipal')
+			->with($reminder, 'principals/users/user001')
+			->willReturn(true);
+
+		$this->notificationProviderManager->expects($this->never())
+			->method('getProvider');
+
+		$this->backend->expects($this->once())
+			->method('removeReminder')
+			->with(1);
+
+		$this->reminderService->processReminders();
+	}
 }