Keep the Lights On is a 2012 American drama film written by Ira Sachs and Mauricio Zacharias and directed by Sachs. It premiered at the 2012 Sundance Film Festival, and was released on September 7, 2012 by Music Box Films. The film stars Thure Lindhardt as Erik, a Danish filmmaker living in New York City to work on a documentary film about artist Avery Willard; while there, he enters into a loving but complicated long-term relationship with Paul (Zachary Booth), a lawyer in the publishing industry who struggles with drug addiction. The film's cast also includes Julianne Nicholson, Souléymane Sy Savané, Paprika Steen, David Anzuelo, Maria Dizzia, and Miguel Del Toro.

The film is based on Sachs' own past relationship with Bill Clegg, a literary agent who published his own memoir about his struggles with addiction, Portrait of an Addict as a Young Man, in 2010.