Madathil Thekkepaattu Vasudevan Nair (born 9 August 1933), popularly known as MT, is an Indian author, screenplay writer and film director. He is a prolific and versatile writer in modern Malayalam literature, and is one of the masters of post-Independence Indian literature. He was born in Kudallur, a small village in the present day Palakkad district (Palghat), which was under the Malabar District in the Madras Presidency of the British Raj.

He has been involved deeply in the film industry and has worked as a script writer, director, lyricist and producer of Malayalam films. He has directed seven films and written the screenplay for around 54 films. He won the National Film Award for Best Screenplay four times for: Oru Vadakkan Veeragatha (1989), Kadavu (1991), Sadayam (1992), and Parinayam (1994), which is the most by anyone in the screenplay category.

He was awarded the highest literary award in India, Jnanpith, in 1995 for his overall contribution to Malayalam literature. In 2005, India's third highest civilian honour Padma Bhushan was awarded to him.