diff --git a/admin/tool/dataprivacy/classes/task/process_data_request_task.php b/admin/tool/dataprivacy/classes/task/process_data_request_task.php
index 7b9fad33b0d..fe3652f3539 100644
--- a/admin/tool/dataprivacy/classes/task/process_data_request_task.php
+++ b/admin/tool/dataprivacy/classes/task/process_data_request_task.php
@@ -127,13 +127,17 @@ class process_data_request_task extends adhoc_task {
             $thing = $fs->create_file_from_pathname($filerecord, $exportedcontent);
             $completestatus = api::DATAREQUEST_STATUS_DOWNLOAD_READY;
         } else if ($request->type == api::DATAREQUEST_TYPE_DELETE) {
-            // Delete the data.
-            $manager = new \core_privacy\manager();
-            $manager->set_observer(new \tool_dataprivacy\manager_observer());
+            // Delete the data for users other than the primary admin, which is rejected.
+            if (is_primary_admin($foruser->id)) {
+                $completestatus = api::DATAREQUEST_STATUS_REJECTED;
+            } else {
+                $manager = new \core_privacy\manager();
+                $manager->set_observer(new \tool_dataprivacy\manager_observer());
 
-            $manager->delete_data_for_user($approvedclcollection);
-            $completestatus = api::DATAREQUEST_STATUS_DELETED;
-            $deleteuser = !$foruser->deleted;
+                $manager->delete_data_for_user($approvedclcollection);
+                $completestatus = api::DATAREQUEST_STATUS_DELETED;
+                $deleteuser = !$foruser->deleted;
+            }
         }
 
         // When the preparation of the metadata finishes, update the request status to awaiting approval.
diff --git a/admin/tool/dataprivacy/createdatarequest_form.php b/admin/tool/dataprivacy/createdatarequest_form.php
index 4c94a8a2a39..63b132d7eb5 100644
--- a/admin/tool/dataprivacy/createdatarequest_form.php
+++ b/admin/tool/dataprivacy/createdatarequest_form.php
@@ -134,6 +134,10 @@ class tool_dataprivacy_data_request_form extends moodleform {
             $errors['type'] = get_string('errorrequestalreadyexists', 'tool_dataprivacy');
         }
 
+        if ($data['type'] == api::DATAREQUEST_TYPE_DELETE && is_primary_admin($data['userid'])) {
+            $errors['type'] = get_string('errorcannotdeleteadmin', 'tool_dataprivacy');
+        }
+
         return $errors;
     }
 }
diff --git a/admin/tool/dataprivacy/lang/en/tool_dataprivacy.php b/admin/tool/dataprivacy/lang/en/tool_dataprivacy.php
index bb3fa709533..881bc953415 100644
--- a/admin/tool/dataprivacy/lang/en/tool_dataprivacy.php
+++ b/admin/tool/dataprivacy/lang/en/tool_dataprivacy.php
@@ -124,6 +124,7 @@ $string['editpurposes'] = 'Edit purposes';
 $string['effectiveretentionperiodcourse'] = '{$a} (after the course end date)';
 $string['effectiveretentionperioduser'] = '{$a} (since the last time the user accessed the site)';
 $string['emailsalutation'] = 'Dear {$a},';
+$string['errorcannotdeleteadmin'] = 'Cannot create deletion request for the primary site admin';
 $string['errorinvalidrequestcreationmethod'] = 'Invalid request creation method!';
 $string['errorinvalidrequeststatus'] = 'Invalid request status!';
 $string['errorinvalidrequesttype'] = 'Invalid request type!';
diff --git a/admin/tool/dataprivacy/lib.php b/admin/tool/dataprivacy/lib.php
index 8655f1ca194..4ff26e966ab 100644
--- a/admin/tool/dataprivacy/lib.php
+++ b/admin/tool/dataprivacy/lib.php
@@ -78,7 +78,7 @@ function tool_dataprivacy_myprofile_navigation(tree $tree, $user, $iscurrentuser
         // Check if the user has an ongoing data deletion request.
         $hasdeleterequest = \tool_dataprivacy\api::has_ongoing_request($user->id, \tool_dataprivacy\api::DATAREQUEST_TYPE_DELETE);
         // Show data deletion link only if the user doesn't have an ongoing data deletion request.
-        if (!$hasdeleterequest) {
+        if (!$hasdeleterequest && !is_primary_admin($user->id)) {
             $deleteparams = ['type' => \tool_dataprivacy\api::DATAREQUEST_TYPE_DELETE];
             $deleteurl = new moodle_url('/admin/tool/dataprivacy/createdatarequest.php', $deleteparams);
             $deletenode = new core_user\output\myprofile\node('privacyandpolicies', 'requestdatadeletion',
diff --git a/admin/tool/dataprivacy/tests/api_test.php b/admin/tool/dataprivacy/tests/api_test.php
index 8e60223b96e..080878f9539 100644
--- a/admin/tool/dataprivacy/tests/api_test.php
+++ b/admin/tool/dataprivacy/tests/api_test.php
@@ -303,6 +303,29 @@ class tool_dataprivacy_api_testcase extends advanced_testcase {
         $requestid = $datarequest->get('id');
     }
 
+    /**
+     * Test that deletion requests for the primary admin are rejected
+     */
+    public function test_reject_data_deletion_request_primary_admin() {
+        $this->resetAfterTest();
+        $this->setAdminUser();
+
+        $datarequest = api::create_data_request(get_admin()->id, api::DATAREQUEST_TYPE_DELETE);
+
+        // Approve the request and execute the ad-hoc process task.
+        ob_start();
+        api::approve_data_request($datarequest->get('id'));
+        $this->runAdhocTasks('\tool_dataprivacy\task\process_data_request_task');
+        ob_end_clean();
+
+        $request = api::get_request($datarequest->get('id'));
+        $this->assertEquals(api::DATAREQUEST_STATUS_REJECTED, $request->get('status'));
+
+        // Confirm they weren't deleted.
+        $user = core_user::get_user($request->get('userid'));
+        core_user::require_active_user($user);
+    }
+
     /**
      * Test for api::can_contact_dpo()
      */
diff --git a/admin/tool/dataprivacy/tests/behat/datadelete.feature b/admin/tool/dataprivacy/tests/behat/datadelete.feature
index e6c7fde6196..671c1e3e6c1 100644
--- a/admin/tool/dataprivacy/tests/behat/datadelete.feature
+++ b/admin/tool/dataprivacy/tests/behat/datadelete.feature
@@ -88,6 +88,12 @@ Feature: Data delete from the privacy API
     And I navigate to "Users > Privacy and policies > Data requests" in site administration
     And I should see "Deleted"
 
+  @javascript
+  Scenario: As a primary admin, the link to create a data deletion request should not be shown.
+    Given I log in as "admin"
+    When I follow "Profile" in the user menu
+    Then I should not see "Delete my account"
+
   @javascript
   Scenario: As a parent, request account and data deletion for my child
     Given I log in as "parent"