diff --git a/services/web/app/src/Features/Collaborators/CollaboratorsController.mjs b/services/web/app/src/Features/Collaborators/CollaboratorsController.mjs
index 849c10d5c5..f7ce8ece8a 100644
--- a/services/web/app/src/Features/Collaborators/CollaboratorsController.mjs
+++ b/services/web/app/src/Features/Collaborators/CollaboratorsController.mjs
@@ -17,6 +17,7 @@ import LimitationsManager from '../Subscription/LimitationsManager.mjs'
 import PrivilegeLevels from '../Authorization/PrivilegeLevels.mjs'
 import { z, zz, parseReq } from '../../infrastructure/Validation.mjs'
 import Features from '../../infrastructure/Features.mjs'
+import UserGetter from '../User/UserGetter.mjs'
 
 const { hasAdminAccess } = AdminAuthorizationHelper
 const ObjectId = mongodb.ObjectId
@@ -39,12 +40,20 @@ async function removeUserFromProject(req, res, next) {
     members: true,
   })
 
+  const removedUser = await UserGetter.promises.getUser(
+    { _id: userId },
+    { email: 1 }
+  )
+
   ProjectAuditLogHandler.addEntryInBackground(
     projectId,
     'remove-collaborator',
     sessionUserId,
     req.ip,
-    { userId }
+    {
+      userId,
+      collaboratorEmail: removedUser?.email,
+    }
   )
 
   res.sendStatus(204)
diff --git a/services/web/app/src/Features/Collaborators/CollaboratorsInviteController.mjs b/services/web/app/src/Features/Collaborators/CollaboratorsInviteController.mjs
index 7cbcb38f8e..099e6a5887 100644
--- a/services/web/app/src/Features/Collaborators/CollaboratorsInviteController.mjs
+++ b/services/web/app/src/Features/Collaborators/CollaboratorsInviteController.mjs
@@ -204,6 +204,7 @@ async function revokeInvite(req, res) {
       req.ip,
       {
         inviteId: invite._id,
+        collaboratorEmail: invite.email,
         role: CollaboratorsInviteHelper.privilegeLevelToRole(invite.privileges),
       }
     )
@@ -380,6 +381,7 @@ async function acceptInvite(req, res) {
     req.ip,
     {
       inviteId: invite._id,
+      collaboratorEmail: invite.email,
       privileges: invite.privileges,
     }
   )
diff --git a/services/web/test/unit/src/Collaborators/CollaboratorsController.test.mjs b/services/web/test/unit/src/Collaborators/CollaboratorsController.test.mjs
index eb61d8073f..cafc5cddd3 100644
--- a/services/web/test/unit/src/Collaborators/CollaboratorsController.test.mjs
+++ b/services/web/test/unit/src/Collaborators/CollaboratorsController.test.mjs
@@ -19,7 +19,7 @@ describe('CollaboratorsController', function () {
     ctx.res = new MockResponse(vi)
     ctx.req = new MockRequest(vi)
 
-    ctx.user = { _id: new ObjectId() }
+    ctx.user = { _id: new ObjectId(), email: 'user@example.com' }
     ctx.projectId = new ObjectId()
     ctx.callback = sinon.stub()
 
@@ -51,6 +51,13 @@ describe('CollaboratorsController', function () {
       getSessionUser: sinon.stub().returns(ctx.user),
       getLoggedInUserId: sinon.stub().returns(ctx.user._id),
     }
+
+    ctx.UserGetter = {
+      promises: {
+        getAllInvitedMembers: sinon.stub(),
+        getUser: sinon.stub().resolves(ctx.user),
+      },
+    }
     ctx.OwnershipTransferHandler = {
       promises: {
         transferOwnership: sinon.stub().resolves(),
@@ -133,6 +140,10 @@ describe('CollaboratorsController', function () {
       })
     )
 
+    vi.doMock('../../../../app/src/Features/User/UserGetter.mjs', () => ({
+      default: ctx.UserGetter,
+    }))
+
     vi.doMock(
       '../../../../app/src/Features/TokenAccess/TokenAccessHandler.mjs',
       () => ({
@@ -207,13 +218,23 @@ describe('CollaboratorsController', function () {
       )
     })
 
+    it('should look up the collaborator email', function (ctx) {
+      expect(ctx.UserGetter.promises.getUser).to.have.been.calledWith(
+        { _id: ctx.user._id },
+        { email: 1 }
+      )
+    })
+
     it('should write a project audit log', function (ctx) {
       ctx.ProjectAuditLogHandler.addEntryInBackground.should.have.been.calledWith(
         ctx.projectId,
         'remove-collaborator',
         ctx.user._id,
         ctx.req.ip,
-        { userId: ctx.user._id }
+        {
+          userId: ctx.user._id,
+          collaboratorEmail: 'user@example.com',
+        }
       )
     })
   })
diff --git a/services/web/test/unit/src/Collaborators/CollaboratorsInviteController.test.mjs b/services/web/test/unit/src/Collaborators/CollaboratorsInviteController.test.mjs
index 8c61e5e479..442067db1b 100644
--- a/services/web/test/unit/src/Collaborators/CollaboratorsInviteController.test.mjs
+++ b/services/web/test/unit/src/Collaborators/CollaboratorsInviteController.test.mjs
@@ -70,7 +70,7 @@ describe('CollaboratorsInviteController', function () {
     ctx.UserGetter = {
       promises: {
         getUserByAnyEmail: sinon.stub(),
-        getUser: sinon.stub(),
+        getUser: sinon.stub().resolves(ctx.currentUser),
       },
     }
 
@@ -1600,6 +1600,7 @@ describe('CollaboratorsInviteController', function () {
           ctx.req.ip,
           {
             inviteId: ctx.invite._id,
+            collaboratorEmail: ctx.invite.email,
             role: ctx.role,
           }
         )
@@ -1689,6 +1690,7 @@ describe('CollaboratorsInviteController', function () {
           ctx.req.ip,
           {
             inviteId: ctx.invite._id,
+            collaboratorEmail: ctx.invite.email,
             privileges: ctx.privileges,
           }
         )