diff --git a/CHANGELOG b/CHANGELOG
index 8ecd2aef025..8524c4082f3 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -100,6 +100,7 @@ v 8.10.0 (unreleased)
   - Fix last update timestamp on issues not preserved on gitlab.com and project imports
   - Fix issues importing projects from EE to CE
   - Fix creating group with space in group path
+  - Create Todos for Issue author when assign or mention himself (Katarzyna Kobierska)
 
 v 8.9.6
   - Fix importing of events under notes for GitLab projects. !5154
diff --git a/app/services/todo_service.rb b/app/services/todo_service.rb
index 6bb0a72d30e..6b48d68cccb 100644
--- a/app/services/todo_service.rb
+++ b/app/services/todo_service.rb
@@ -194,7 +194,7 @@ class TodoService
   end
 
   def create_assignment_todo(issuable, author)
-    if issuable.assignee && issuable.assignee != author
+    if issuable.assignee
       attributes = attributes_for_todo(issuable.project, issuable, author, Todo::ASSIGNED)
       create_todos(issuable.assignee, attributes)
     end
@@ -239,7 +239,6 @@ class TodoService
   def filter_mentioned_users(project, target, author)
     mentioned_users = target.mentioned_users(author)
     mentioned_users = reject_users_without_access(mentioned_users, project, target)
-    mentioned_users.delete(author)
     mentioned_users.uniq
   end
 
diff --git a/spec/services/todo_service_spec.rb b/spec/services/todo_service_spec.rb
index 83c18a35472..34d8ea9090e 100644
--- a/spec/services/todo_service_spec.rb
+++ b/spec/services/todo_service_spec.rb
@@ -35,8 +35,11 @@ describe TodoService, services: true do
         should_not_create_any_todo { service.new_issue(unassigned_issue, author) }
       end
 
-      it 'does not create a todo if assignee is the current user' do
-        should_not_create_any_todo { service.new_issue(unassigned_issue, john_doe) }
+      it 'creates a todo if assignee is the current user' do
+        unassigned_issue.update_attribute(:assignee, john_doe)
+        service.new_issue(unassigned_issue, john_doe)
+
+        should_create_todo(user: john_doe, target: unassigned_issue, author: john_doe, action: Todo::ASSIGNED)
       end
 
       it 'creates a todo for each valid mentioned user' do
@@ -44,7 +47,7 @@ describe TodoService, services: true do
 
         should_create_todo(user: member, target: issue, action: Todo::MENTIONED)
         should_create_todo(user: guest, target: issue, action: Todo::MENTIONED)
-        should_not_create_todo(user: author, target: issue, action: Todo::MENTIONED)
+        should_create_todo(user: author, target: issue, action: Todo::MENTIONED)
         should_not_create_todo(user: john_doe, target: issue, action: Todo::MENTIONED)
         should_not_create_todo(user: non_member, target: issue, action: Todo::MENTIONED)
       end
@@ -57,7 +60,7 @@ describe TodoService, services: true do
         should_create_todo(user: member, target: confidential_issue, author: john_doe, action: Todo::MENTIONED)
         should_create_todo(user: admin, target: confidential_issue, author: john_doe, action: Todo::MENTIONED)
         should_not_create_todo(user: guest, target: confidential_issue, author: john_doe, action: Todo::MENTIONED)
-        should_not_create_todo(user: john_doe, target: confidential_issue, author: john_doe, action: Todo::MENTIONED)
+        should_create_todo(user: john_doe, target: confidential_issue, author: john_doe, action: Todo::MENTIONED)
       end
 
       context 'when a private group is mentioned' do
@@ -87,7 +90,7 @@ describe TodoService, services: true do
         should_create_todo(user: member, target: issue, action: Todo::MENTIONED)
         should_create_todo(user: guest, target: issue, action: Todo::MENTIONED)
         should_create_todo(user: john_doe, target: issue, action: Todo::MENTIONED)
-        should_not_create_todo(user: author, target: issue, action: Todo::MENTIONED)
+        should_create_todo(user: author, target: issue, action: Todo::MENTIONED)
         should_not_create_todo(user: non_member, target: issue, action: Todo::MENTIONED)
       end
 
@@ -105,7 +108,7 @@ describe TodoService, services: true do
         should_create_todo(user: member, target: confidential_issue, author: john_doe, action: Todo::MENTIONED)
         should_create_todo(user: admin, target: confidential_issue, author: john_doe, action: Todo::MENTIONED)
         should_not_create_todo(user: guest, target: confidential_issue, author: john_doe, action: Todo::MENTIONED)
-        should_not_create_todo(user: john_doe, target: confidential_issue, author: john_doe, action: Todo::MENTIONED)
+        should_create_todo(user: john_doe, target: confidential_issue, author: john_doe, action: Todo::MENTIONED)
       end
 
       context 'issues with a task list' do
@@ -156,10 +159,11 @@ describe TodoService, services: true do
         should_not_create_any_todo { service.reassigned_issue(issue, author) }
       end
 
-      it 'does not create a todo if new assignee is the current user' do
+      it 'creates a todo if new assignee is the current user' do
         unassigned_issue.update_attribute(:assignee, john_doe)
+        service.reassigned_issue(unassigned_issue, john_doe)
 
-        should_not_create_any_todo { service.reassigned_issue(unassigned_issue, john_doe) }
+        should_create_todo(user: john_doe, target: unassigned_issue, author: john_doe, action: Todo::ASSIGNED)
       end
     end
 
@@ -250,7 +254,7 @@ describe TodoService, services: true do
         should_create_todo(user: member, target: issue, author: john_doe, action: Todo::MENTIONED, note: note)
         should_create_todo(user: guest, target: issue, author: john_doe, action: Todo::MENTIONED, note: note)
         should_create_todo(user: author, target: issue, author: john_doe, action: Todo::MENTIONED, note: note)
-        should_not_create_todo(user: john_doe, target: issue, author: john_doe, action: Todo::MENTIONED, note: note)
+        should_create_todo(user: john_doe, target: issue, author: john_doe, action: Todo::MENTIONED, note: note)
         should_not_create_todo(user: non_member, target: issue, author: john_doe, action: Todo::MENTIONED, note: note)
       end
 
@@ -262,7 +266,7 @@ describe TodoService, services: true do
         should_create_todo(user: member, target: confidential_issue, author: john_doe, action: Todo::MENTIONED, note: note_on_confidential_issue)
         should_create_todo(user: admin, target: confidential_issue, author: john_doe, action: Todo::MENTIONED, note: note_on_confidential_issue)
         should_not_create_todo(user: guest, target: confidential_issue, author: john_doe, action: Todo::MENTIONED, note: note_on_confidential_issue)
-        should_not_create_todo(user: john_doe, target: confidential_issue, author: john_doe, action: Todo::MENTIONED, note: note_on_confidential_issue)
+        should_create_todo(user: john_doe, target: confidential_issue, author: john_doe, action: Todo::MENTIONED, note: note_on_confidential_issue)
       end
 
       it 'creates a todo for each valid mentioned user when leaving a note on commit' do
@@ -270,7 +274,7 @@ describe TodoService, services: true do
 
         should_create_todo(user: member, target_id: nil, target_type: 'Commit', commit_id: note_on_commit.commit_id, author: john_doe, action: Todo::MENTIONED, note: note_on_commit)
         should_create_todo(user: author, target_id: nil, target_type: 'Commit', commit_id: note_on_commit.commit_id, author: john_doe, action: Todo::MENTIONED, note: note_on_commit)
-        should_not_create_todo(user: john_doe, target_id: nil, target_type: 'Commit', commit_id: note_on_commit.commit_id, author: john_doe, action: Todo::MENTIONED, note: note_on_commit)
+        should_create_todo(user: john_doe, target_id: nil, target_type: 'Commit', commit_id: note_on_commit.commit_id, author: john_doe, action: Todo::MENTIONED, note: note_on_commit)
         should_not_create_todo(user: non_member, target_id: nil, target_type: 'Commit', commit_id: note_on_commit.commit_id, author: john_doe, action: Todo::MENTIONED, note: note_on_commit)
       end
 
@@ -312,7 +316,7 @@ describe TodoService, services: true do
 
         should_create_todo(user: member, target: mr_assigned, action: Todo::MENTIONED)
         should_create_todo(user: guest, target: mr_assigned, action: Todo::MENTIONED)
-        should_not_create_todo(user: author, target: mr_assigned, action: Todo::MENTIONED)
+        should_create_todo(user: author, target: mr_assigned, action: Todo::MENTIONED)
         should_not_create_todo(user: john_doe, target: mr_assigned, action: Todo::MENTIONED)
         should_not_create_todo(user: non_member, target: mr_assigned, action: Todo::MENTIONED)
       end
@@ -325,7 +329,7 @@ describe TodoService, services: true do
         should_create_todo(user: member, target: mr_assigned, action: Todo::MENTIONED)
         should_create_todo(user: guest, target: mr_assigned, action: Todo::MENTIONED)
         should_create_todo(user: john_doe, target: mr_assigned, action: Todo::MENTIONED)
-        should_not_create_todo(user: author, target: mr_assigned, action: Todo::MENTIONED)
+        should_create_todo(user: author, target: mr_assigned, action: Todo::MENTIONED)
         should_not_create_todo(user: non_member, target: mr_assigned, action: Todo::MENTIONED)
       end
 
@@ -382,10 +386,11 @@ describe TodoService, services: true do
         should_not_create_any_todo { service.reassigned_merge_request(mr_assigned, author) }
       end
 
-      it 'does not create a todo if new assignee is the current user' do
+      it 'creates a todo if new assignee is the current user' do
         mr_assigned.update_attribute(:assignee, john_doe)
+        service.reassigned_merge_request(mr_assigned, john_doe)
 
-        should_not_create_any_todo { service.reassigned_merge_request(mr_assigned, john_doe) }
+        should_create_todo(user: john_doe, target: mr_assigned, author: john_doe, action: Todo::ASSIGNED)
       end
     end