John O'May is an American-born Australian actor, best known for his stage performances.

O'May was born at Johns Hopkins Hospital in Baltimore, Maryland, one of four children. He grew up with a love of reading and literature. At university he dabbled in theatre, learning acting, stagecraft and building sets. He became a teacher at Patapsco High School, where he himself had attended high school. He taught English literature for two and a half years. He eventually travelled overseas, and after visiting his sister in Australia and ended up staying.