Maximilian I Joseph (27 May 1756 – 13 October 1825) was Duke of Zweibrücken from 1795 to 1799, prince-elector of Bavaria (as Maximilian IV Joseph) from 1799 to 1806, then King of Bavaria (as Maximilian I Joseph) from 1806 to 1825.

Duke Maximilian Joseph in Bavaria (4 December 1808 – 15 November 1888), known informally as Max in Bayern, was a member of a junior branch of the royal House of Wittelsbach who were Kings of Bavaria, and a promoter of Bavarian folk-music.