diff --git a/app/controllers/projects_controller.rb b/app/controllers/projects_controller.rb
index 0338c912b533307bfd8c00738d5359bf67b40462..71ad747b6b1da3e3e3b922a44ab43ba77d568dc9 100644
--- a/app/controllers/projects_controller.rb
+++ b/app/controllers/projects_controller.rb
@@ -228,7 +228,16 @@ def housekeeping
              :eager
            end
 
-    ::Repositories::HousekeepingService.new(@project, task).execute
+    ::Repositories::HousekeepingService.new(@project, task).execute do
+      ::Gitlab::Audit::Auditor.audit(
+        name: 'manually_trigger_housekeeping',
+        author: current_user,
+        scope: @project,
+        target: @project,
+        message: "Housekeeping task: #{task}",
+        created_at: DateTime.current
+      )
+    end
 
     redirect_to(
       project_path(@project),
diff --git a/config/audit_events/types/manually_trigger_housekeeping.yml b/config/audit_events/types/manually_trigger_housekeeping.yml
new file mode 100644
index 0000000000000000000000000000000000000000..70c9818d8e80f8c12c90c4711b70bdc8899e66eb
--- /dev/null
+++ b/config/audit_events/types/manually_trigger_housekeeping.yml
@@ -0,0 +1,9 @@
+---
+name: manually_trigger_housekeeping
+description: Triggered when manually triggering housekeeping via api or admin UI
+introduced_by_issue: https://gitlab.com/gitlab-org/gitlab/-/issues/390761
+introduced_by_mr: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/112095
+feature_category: source_code_management
+milestone: '15.9'
+saved_to_database: true
+streamed: true
diff --git a/lib/api/projects.rb b/lib/api/projects.rb
index 36c132fdc100599c2395a09f7876ecc62eee8d6e..6eea56ea117f72985493188ccb65dc45b208ad18 100644
--- a/lib/api/projects.rb
+++ b/lib/api/projects.rb
@@ -875,7 +875,16 @@ def add_import_params(params)
         authorize_admin_project
 
         begin
-          ::Repositories::HousekeepingService.new(user_project, params[:task]).execute
+          ::Repositories::HousekeepingService.new(user_project, params[:task]).execute do
+            ::Gitlab::Audit::Auditor.audit(
+              name: 'manually_trigger_housekeeping',
+              author: current_user,
+              scope: user_project,
+              target: user_project,
+              message: "Housekeeping task: #{params[:task]}",
+              created_at: DateTime.current
+            )
+          end
         rescue ::Repositories::HousekeepingService::LeaseTaken => error
           conflict!(error.message)
         end
diff --git a/spec/controllers/projects_controller_spec.rb b/spec/controllers/projects_controller_spec.rb
index c0c5dcfe21d783971f9e283f04ed1810fdb10711..cf87b2c443738d1c17b47c24058f76a8dac595cc 100644
--- a/spec/controllers/projects_controller_spec.rb
+++ b/spec/controllers/projects_controller_spec.rb
@@ -664,6 +664,20 @@ def get_show
         expect(response).to have_gitlab_http_status(:found)
       end
 
+      it 'logs an audit event' do
+        expect(housekeeping).to receive(:execute).once.and_yield
+
+        expect(::Gitlab::Audit::Auditor).to receive(:audit).with(a_hash_including(
+          name: 'manually_trigger_housekeeping',
+          author: user,
+          scope: project,
+          target: project,
+          message: "Housekeeping task: eager"
+        ))
+
+        subject
+      end
+
       context 'and requesting prune' do
         let(:prune) { true }
 
diff --git a/spec/requests/api/projects_spec.rb b/spec/requests/api/projects_spec.rb
index 9a481c524e2ec7998d1f53ca4cad585604492fa8..e78ef2f763028dc790df5f15537dc77c217e7ff4 100644
--- a/spec/requests/api/projects_spec.rb
+++ b/spec/requests/api/projects_spec.rb
@@ -4719,6 +4719,9 @@ def failure_message(diff)
 
   describe 'POST /projects/:id/housekeeping' do
     let(:housekeeping) { Repositories::HousekeepingService.new(project) }
+    let(:params) { {} }
+
+    subject { post api("/projects/#{project.id}/housekeeping", user), params: params }
 
     before do
       allow(Repositories::HousekeepingService).to receive(:new).with(project, :eager).and_return(housekeeping)
@@ -4728,26 +4731,45 @@ def failure_message(diff)
       it 'starts the housekeeping process' do
         expect(housekeeping).to receive(:execute).once
 
-        post api("/projects/#{project.id}/housekeeping", user)
+        subject
 
         expect(response).to have_gitlab_http_status(:created)
       end
 
+      it 'logs an audit event' do
+        expect(housekeeping).to receive(:execute).once.and_yield
+        expect(::Gitlab::Audit::Auditor).to receive(:audit).with(a_hash_including(
+          name: 'manually_trigger_housekeeping',
+          author: user,
+          scope: project,
+          target: project,
+          message: "Housekeeping task: eager"
+        ))
+
+        subject
+      end
+
       context 'when requesting prune' do
+        let(:params) { { task: :prune } }
+
         it 'triggers a prune' do
           expect(Repositories::HousekeepingService).to receive(:new).with(project, :prune).and_return(housekeeping)
           expect(housekeeping).to receive(:execute).once
 
-          post api("/projects/#{project.id}/housekeeping", user), params: { task: :prune }
+          subject
 
           expect(response).to have_gitlab_http_status(:created)
         end
       end
 
       context 'when requesting an unsupported task' do
+        let(:params) { { task: :unsupported_task } }
+
         it 'responds with bad_request' do
           expect(Repositories::HousekeepingService).not_to receive(:new)
-          post api("/projects/#{project.id}/housekeeping", user), params: { task: :unsupported_task }
+
+          subject
+
           expect(response).to have_gitlab_http_status(:bad_request)
         end
       end
@@ -4756,7 +4778,7 @@ def failure_message(diff)
         it 'returns conflict' do
           expect(housekeeping).to receive(:execute).once.and_raise(Repositories::HousekeepingService::LeaseTaken)
 
-          post api("/projects/#{project.id}/housekeeping", user)
+          subject
 
           expect(response).to have_gitlab_http_status(:conflict)
           expect(json_response['message']).to match(/Somebody already triggered housekeeping for this resource/)