Mouna Guru (transl. The Silent Teacher) is a 2011 Indian Tamil-language action thriller film directed by Santha Kumar and produced by M. K. Thamizharasu. The film stars Arulnidhi and Ineya, while John Vijay, Madhusudhan Rao, Uma Riyaz Khan, Krishnamoorthy, and Balakrishnan play supporting roles. Mouna Guru illustrates a misunderstood college youth who becomes unwittingly involved in a crime plot that spirals his life out of order.

The film's soundtrack has been composed by S. Thaman. It was released on 16 December 2011 and received highly positive reviews, subsequently becoming a sleeper hit. The film was remade in Kannada as Guru, in Telugu as Shankara and in Hindi as Akira.