Ron Leibman (October 11, 1937 – December 6, 2019) was an American actor. He won both the Tony Award for Best Actor in a Play and the Drama Desk Award for Outstanding Actor in a Play in 1993 for his performance as Roy Cohn in Angels in America. Leibman also won a Primetime Emmy Award in 1979 for his role as Martin 'Kaz' Kazinsky in his short-lived crime drama series Kaz.

Leibman also acted in films such as Where's Poppa? (1970), The Hot Rock (1972), Norma Rae (1979), and Zorro, The Gay Blade (1982). Later in his career, he became widely known for providing the voice of Ron Cadillac in Archer (2013–2016) and for playing Dr. Leonard Green, Rachel's rich, short-tempered father, on the sitcom Friends (1996–2004).