Mike Farrell (born February 6, 1939) is an American actor, best known for his role as Captain B.J. Hunnicutt from 1975 until 1983 on the television series M*A*S*H. More recently, Farrell starred on the television series Providence.

Farrell lends his minor celebrity status to political causes, some national or international and some local to the Los Angeles region, including the grocery workers' union strikes in 2003-2004, long-term efforts to end homelessness and hunger, and opposition to capital punishment.