C.I.D. is a 1955 Indian Malayalam film made for Merryland Studio by director M. Krishnan Nair which stars Prem Nazir, Miss Kumari, Kottarakkara Sreedharan Nair and Kumari Thankam. It is generally considered as the first crime thriller movie in Malayalam.
The film was dubbed into Tamil with the same title and was released in the same year, 1955. K. Devanarayanan wrote the lyrics and dialogues.
C.I.D. Sudhakaran discovers who is behind the murder and in the end marries Menon's daughter Vasanthi.