Louis Burt Mayer (July 12, 1884 – October 29, 1957) born Lazar Meir was a Canadian American film producer. He is generally cited as the creator of the "star system" within Metro-Goldwyn-Mayer (MGM) in its golden years. Known always as Louis B. Mayer and often simply as "L.B.", he believed in wholesome entertainment and went to great lengths so that MGM had "more stars than there are in the heavens".

He was born possibly on July 12, 1884, in a Jewish family in Minsk, Russian Empire.