Aubrey Levin (born 18 December 1938) is a South African-born Canadian psychiatrist and former Colonel in the South African Defence Force who used abusive procedures on homosexual army conscripts and conscientious objectors in an attempt to cure them of suspected same-sex attraction in apartheid era South Africa. During the 1970s and 1980s, Levin subjected many homosexual men and women to electroshock or chemical castration, and over 900 conscripts were forced to undergo involuntary sexual reassignment surgery.