Brother's Day is a 2019 Indian Malayalam-language action thriller film written and directed by Kalabhavan Shajohn in his directorial debut. Produced by Listin Stephen, the film stars Prithviraj Sukumaran, Prasanna and Aishwarya Lekshmi. The film marks the debut of Prasanna as actor and Dhanush as singer and lyricist in Malayalam cinema. Music for the film was composed by 4 Musics. Principal photography began on 16 March 2019 and was completed in mid-July after a 96-day long filming. The film was released in theatres worldwide on 6 September 2019.