Michael Joseph Farrell Jr. (born February 6, 1939 St. Paul, Minnesota, USA) is an American actor, best known for his role as Captain B.J. Hunnicutt on the television series M*A*S*H (1975–83). He is also an activist and public speaker for various political causes.
Farrell was a producer of Patch Adams (1998) starring Robin Williams, and starred in the television series Providence (1999–2002). He appeared as Milton Lang, the father of Victor Lang (John Slattery), husband of Gabrielle Solis (Eva Longoria) on Desperate Housewives (2007–08).
He was seen in the season 10 episode "Persona" of Law & Order: Special Victims Unit. He appeared as the character Fred Jones in the season 8 episode "Hunteri Heroici" of Supernatural. In 2014 he was a supporting cast member on the Sundance TV Network criminal drama series The Red Road. He portrayed Lee Miglin, a real estate baron who fell victim to serial killer Andrew Cunanan, in FX's anthology series American Crime Story: The Assassination of Gianni Versace. Most recently, he appeared in NCIS, playing the role of Judge Miles Deakin in "Judge, Jury..." and "...and Executioner"