P. Padmarajan (23 May 1945 – 24 January 1991) was an Indian film maker, screenwriter and author who was known for his works in Malayalam literature and Malayalam cinema. He was the founder of a new school of film making in Malayalam cinema, along with Bharathan and K. G. George, in the 1980s.

Padmarajan was known for his detailed screenwriting and expressive direction style and made some of the landmark motion pictures in Malayalam cinema. He won the Kerala Sahithya Academy Award in 1972 for his novel Nakshathrangale Kaval. He made his directorial debut in 1979 with Peruvazhiyambalam which won the National Film Award for Best Feature Film in Malayalam. He won his second National Award in 1986 with Thinkalaazhcha Nalla Divasam. Padmarajan had won six Kerala State Film Awards which includes two awards for Best Story in 1978, 1979 and two awards for Best Screenplay in 1984 and 1986. He has written screenplay for thirty seven movies among which eighteen he directed. The screenplay for all the movies he directed were written by Padmarajan himself. Njan Gandharvan was his last movie and within a week of its release, he died at Kozhikode due to sudden cardiac arrest.