The Lost Boys are characters from J. M. Barrie's 1904 play Peter Pan, or The Boy Who Wouldn't Grow Up and later adaptations and extensions to the story. They are boys "who fall out of their prams when the nurse is looking the other way and if they are not claimed in seven days, they are sent far away to the Neverland," where Peter Pan is their captain.

Peter Pan; or, the Boy Who Wouldn't Grow Up, often known simply as Peter Pan, is a work by J. M. Barrie, in the form of a 1904 play and a 1911 novel titled Peter and Wendy, often extended in Peter Pan and Wendy. Both versions tell the story of Peter Pan, a mischievous little boy who can fly, and has many adventures on the island of Neverland that is inhabited by mermaids, fairies, Native Americans, and pirates. The Peter Pan stories also involve the characters Wendy Darling and her two brothers John and Michael, Peter's fairy Tinker Bell, the Lost Boys, and the pirate Captain Hook. The play and novel were inspired by Barrie's friendship with the Llewelyn Davies family.