Moondrezhuthu (transl. Three letters) is a 1968 Indian Tamil-language crime film, directed by T. R. Ramanna, produced by T. K. Ramarajan and written by T. N. Balu. Music was by T. K. Ramamoorthy. The film stars Ravichandran, Jayalalithaa, Srividya and Sheela. It was released on 10 May 1968.