Herbert Jefferson Jr., (born September 28, 1946, Sandersville, Georgia) is an American film, television, and stage actor.

Jefferson also appeared as a guest star in the pilot episodes of both the 1982 TV series Knight Rider as Muntzy, an undercover police officer and partner of Michael Long (who becomes Michael Knight), and the 1984 pilot of the TV series Airwolf, as the commander of the aircraft carrier USS Enterprise.

He is probably best known for his role as Lieutenant Boomer on the original Battlestar Galactica television series, a role made possible when the intended actor, Terry Carter, was injured by roller skating, but was still cast as Colonel Tigh in the series.

He also appeared in two films starring football legend Jim Brown, Black Gunn (1972), as his brother, The Slams (1973), as his cellmate, and Roger Corman's Private Duty Nurses (1971), as activist Dr. Elton Sanders, which marked his feature-film debut.

In 2007, he portrayed Captain Galt, a freedom fighter, in the Internet miniseries Star Trek: Of Gods and Men, from the same independent production company.