A lost episode is an episode of a television or radio series which now is, or in the past was, not available for rerun or release on home video or DVD.

• Lost television broadcast, television series or their episodes that are missing

Lost episode may also refer to:

• List of Lost episodes, episodes of the television series Lost
• "The Sponge Who Could Fly", also titled "The Lost Episode", an episode of SpongeBob SquarePants
• "The Lost Episode", an episode of Blue's Clues
• Also to a famous creepypasta typology which generally tells of episodes of children's cartoons that were never broadcast because they were involved in macabre events. Famous exaples are:
• Suicidemouse.avi, a 9 minutes white and black Mickey Mouse looped video probably produced by Disney in 1930s in which the protagnist, in the second version, committing suicide;
• Dead Bart, an inedit episode of The Simpsons in which Bart, dies after a plane fall;

• Candle Cove, a 1970s children's series with creepy puppets;

• Squidward's Suicide, a SpongeBob SquarePants inedit episode in which Squidward committing suicide shooting himself.