C.I.D Moosa is a 2003 Indian Malayalam-language action comedy thriller film directed by Johny Antony, written by Udaykrishna–Sibi K. Thomas duo, and co-produced by Dileep. It stars Dileep in the title role of a private detective, and also features Bhavana, Murali, Ashish Vidyarthi (in his Malayalam debut), Harisree Ashokan, Cochin Haneefa, Jagathy Sreekumar, Captain Raju, Oduvil Unnikrishnan, and Salim Kumar. In the film, C.I.D Moosa, a private detective, faces many challenges while solving various cases. His only rival is his own brother-in-law, Peethambaran, who is a police officer.

The film was released on 4 July 2003. It was a box office success, becoming the second highest-grossing Malayalam film of the year, behind Balettan. The film is known for its slapstick comedy and has developed a cult following. C.I.D Moosa was remade in Tamil as Cheena Thaana 001, in Kannada as CID Eesha and in Telugu as Ramachari.

A sequel has been officially confirmed to be in the works by the makers.