Sagan om Karl-Bertil Jonssons julafton (lit., The Tale of Karl-Bertil Jonsson's Christmas Eve) (Christopher's Christmas Mission) is a 1975 Swedish animated short film and television film directed by Per Åhlin, adapted from Tage Danielsson's short story of the same name, telling the tale of a boy who steals Christmas gifts from the wealthy to give to the poor people of Stockholm while working in a post office on Christmas Eve. The short story is also published in English with drawings by Per Åhlin by Trollboken AB 2018. The film has gained huge popularity in Sweden, and is broadcast every Christmas Eve on Swedish and Norwegian national television. It is also often shown on Christmas Eve by FST in Finland.

The film was dubbed into English in 1987, with Bernard Cribbins as the voice-over.