John Erwin is a voice-actor known for voicing Morris the Cat and He-Man.

Erwin was the voice of He-Man in the Filmation production He-Man and the Masters of the Universe that ran from 1983 to 1985. Due to the extreme cost-cutting by Filmation the cast of voice-actors was small and producer Lou Scheimer actually performed the bulk of the character voices. Erwin was also the voice of the henchman-character Beast-Man and would on occasion do the voices of other supporting characters as well, such as Webstor and Ram-Man.

Although generally recognised for his work on He-Man, John Erwin has many years of voice acting to his credit (including, but not limited to, the voice of Reggie Mantle in Filmation's Archie canon), and has provided voice work for many productions ranging from television adverts to live action movies ever since the 1960s.

Best known as the voice of "Morris the Cat" in the series of TV commercials for 9-Lives cat food during the 1970s.

Voice of Prince Adam/He-Man from the 1980s TV series "He-Man & The Masters of the Universe".

Best friend of author/primitive artist Mike Falco.