"Gone Maggie Gone" is the thirteenth episode of the twentieth season of the American animated television series The Simpsons. It originally aired on the Fox network in the United States on March 15, 2009. The episode was written by both Billy Kimball and longtime Simpsons writer Ian Maxtone-Graham, and directed by Chris Clements. In the episode, Homer leaves Maggie on the doorstep of a convent, but when she disappears, Lisa goes undercover as a nun to solve the mystery and find her. Meanwhile, Homer tries to keep Maggie's disappearance a secret from Marge, who was temporarily blinded while watching a solar eclipse.

The twentieth season of the American animated television series The Simpsons aired on Fox from September 28, 2008, to May 17, 2009. With this season, the show tied Gunsmoke as the longest-running American primetime television series in terms of total number of seasons. The season was released on Blu-ray on January 12, 2010, making this the first season to be released on Blu-ray as well as the only one to contain both 16:9 widescreen and high-definition episodes. It was released on DVD in Region 1 on January 12, 2010, and in Region 4 on January 20, 2010. The season was only released on DVD in Region 2 on September 17, 2010, in a few areas.