Frank Portman, better known by the pseudonym Dr. Frank, is an American musician, singer, guitarist, and author. He is the singer, guitarist, and primary songwriter of the Berkeley, California punk rock band The Mr. T Experience, and has remained the only consistent member of the band since its formation in 1985. He has performed on ten studio albums and five EPs.

In addition to his music career, Portman has pursued a writing career in young adult literature. He is the author of the novels King Dork (2006), Andromeda Klein (2009), and King Dork Approximately (2014).

As a solo artist, he released the album Show Business is My Life in 1999 and the EP Eight Little Songs in 2003.