Rii Sen (born 26 July) is an Indian actress who works in Bengali cinema. She started her career as a freelance model and a television actress. Her debut film was Tepantorer Mathe, but it was not released in theatres because of obscene scenes. She has acted in movies like Bishh, Gandu, and Cosmic Sex.

Sen is considered as a notable actress of alternative Bengali cinema. She won a best actress award at Osian's Cinefan Festival of Asian and Arab Cinema for her movie Cosmic Sex.