Alan Oppenheimer is an American actor who played and voiced several Star Trek characters.

Oppenheimer played Koroth in the Star Trek: The Next Generation episode "Rightful Heir", Declan Keogh in the Star Trek: Deep Space Nine episode "The Jem'Hadar" and a Nezu ambassador in the Star Trek: Voyager episode "Rise". In Starfleet Command Volume II: Empires at War, Oppenheimer voiced several characters.

Oppenheimer is perhaps best known as the voice of Skeletor in He-Man and the Masters of the Universe.