Dog Day Afternoon is a 1975 film directed by Sidney Lumet and starring Al Pacino. It follows a botched bank robbery by Sonny Wortzik (based on real-life bank robber John Stanley Wojtowicz) and his partner Salvatore Naturile, who barricade themselves inside the building with a number of hostages, and attempt to negotiate an escape.

The film, with its gritty urbanism, is regarded as one of the pillars of 1970s American filmmaking, and is noteworthy for its portrayal of Wortzik's homosexuality and his relationship with a pro-operative transsexual -- the character Leon Schermer, based on the real-life Ernest Aron and played by Chris Sarandon.