Gregory Ralph Evigan (born October 14, 1953) is an American actor best known for his roles on the TV series B.J. and the Bear, My Two Dads, P.S. I Luv U, and TekWar.

He began his career in theater, appearing in the Broadway production of Jesus Christ Superstar, followed by a stage production of the musical Grease, in which he portrayed the lead, Danny Zuko. He made his feature film debut in Scorchy (1976), then was cast as the lead in the comedy series B. J. and the Bear, in which he starred between 1979 and 1981.

He continued to appear as a guest star on numerous television series throughout the 1980s before being cast as the lead Joey Harris in the comedy series My Two Dads (1987–1990). He later appeared on the science fiction series TekWar (1995–1996), and had guest-starring roles on Melrose Place (1996–1997) and 7th Heaven (1997). He subsequently had starring roles on the soap opera Pacific Palisades (also 1997), and portrayed a record executive in the Canadian series Big Sound from 2001 to 2002.

His other film credits include the Joey Travolta–directed drama films Mel (1998) and Arizona Summer (2004), the Western film 6 Guns (2010), and the Hallmark Channel film Once Upon a Holiday (2015). In 2018, he guest-starred in a multi-episode arc as Jim Harvey on the soap opera General Hospital.