John Michael Thomas (born December 3, 1949) is an American rock singer, best known as one of the lead vocalists of Jefferson Starship and Starship.

Thomas was born in Cairo, Georgia, on December 3, 1949. He was inspired to pursue a career in music after travelling to Atlanta with longtime childhood friends Charles Connell and Tommy Verran to see a Beatles performance in 1965. Thomas, Connell, and Verran formed their first band together; Verran was the lead vocalist. They disbanded while attending different colleges, but later reformed in the early 1970s along with friend Bud Thomas as the Jets.

Thomas was the vocalist for the Lords of London, a garage band from Douglas, Georgia, for a brief time, along with guitarist Billy Folsom, bassist Bob Hutchinson, keyboardist Billy Corbi, and drummer Troy Blasingame.

While singing lead for the Jets in 1974, Thomas joined the Elvin Bishop Group as a backing vocalist and eventually made it to lead vocals.