John Alton, born Johann Jacob Altmann, in Sopron, Kingdom of Hungary, was an American cinematographer of Hungarian-German origin. Alton photographed some of the most famous films noir of the classic period and won an Academy Award for the cinematography of An American in Paris (1951), becoming the first Hungarian-born person to do so in the cinematography category.

An American in Paris is a 1951 American musical romantic comedy film inspired by the 1928 jazz-influenced symphonic poem An American in Paris by George Gershwin. Starring Gene Kelly, Leslie Caron, Oscar Levant, Georges Guétary, and Nina Foch, the film is set in Paris, and was directed by Vincente Minnelli from a script by Alan Jay Lerner. The music is by George Gershwin, with lyrics by his brother Ira, with additional music by Johnny Green, and Saul Chaplin, the music directors.