Matthias Koehl Jr. (January 22, 1935 – October 9, 2014) was an American neo-Nazi politician and religious leader who served as the second leader of the American Nazi Party from 1967 to 2014. He joined the party in 1960 following membership in various White supremacist groups, and succeeded to leadership following the assassination of the founder of the party, George Lincoln Rockwell, in 1967.