"Heart" is the thirteenth episode of the third season of the American musical television series Glee, and the fifty-seventh overall. Written by Ali Adler and directed by co-creator Brad Falchuk, the episode aired on Fox in the United States on February 14, 2012, and features Valentine's Day love songs performed by the McKinley High glee club. It also features the debuts of special guest stars Jeff Goldblum and Brian Stokes Mitchell as Rachel's two fathers and The Glee Project winner Samuel Larsen as transfer student Joe Hart.

The third season of the musical comedy-drama television series Glee was commissioned on May 23, 2010, by Fox while the first season aired. It aired between September 20, 2011, and May 22, 2012, and was produced by 20th Century Fox Television and Ryan Murphy Television, with executive producers Dante Di Loreto and series co-creators Ryan Murphy, Brad Falchuk and Ian Brennan.