Brian Kerwin (born October 25, 1949) is an American actor.

Born in Chicago, Illinois, Kerwin won the Theatre World Award in 1988 for the off-Broadway play Emily. His Broadway theatre credits include the 1997 revival of The Little Foxes and the Elaine May comedy After the Night and the Music in 2005. That same year he starred in Edward Albee's The Goat or Who is Sylvia? at the Mark Taper Forum.

In 1989 he had played Nick in a revival of Albee's Who's Afraid of Virginia Woolf? at the Doolittle Theatre (now the Ricardo Montalbán Theatre) in Los Angeles. The production, directed by the playwright, also featured Glenda Jackson and John Lithgow, with Cynthia Nixon as his character's wife, Honey. The production was not well received. He played opposite Kathy Baker in the South Coast Repertory production of The Man from Nebraska in 2006. His most recent stage appearance was in the original Broadway production of August: Osage County.

Kerwin's feature films include Murphy's Romance, Hard Promises, 27 Dresses (as Katherine Heigl's character's father), Torch Song Trilogy, Love Field, Jack, King Kong Lives, The Myth of Fingerprints, and Debating Robert Lee. Kerwin has enjoyed an extensive career in television, beginning with the daytime serial The Young and the Restless in 1976.

In addition to many television movies, his credits include a regular role on the Showtime series Beggars and Choosers, recurring roles on The Misadventures of Sheriff Lobo, The Chisholms (four 1979 episodes as Gideon Chisholm), Roseanne, The West Wing, Nip/Tuck and Big Love and guest appearances in The Love Boat, Simon & Simon, Highway to Heaven, Murder, She Wrote, St. Elsewhere, Frasier, Law & Order, Law & Order: Special Victims Unit, Blue Bloods, Boston Legal, Medium, Without a Trace, and Desperate Housewives. In 2007, he joined the cast of the soap opera One Life to Live.