Don McManus (born November 8, 1959) (sometimes credited as Don R. McManus) is an American character actor of film and television. He became better known after his performance as Duncan in the Seinfeld episode "The Race". Born in San Diego, California, he is a graduate of Yale University.

Career
McManus's film credits include Vice, Grand Piano, Under the Silver Lake, The Maze Runner, Lucky Bastard, Lovelace, Dark Around the Stars, For A Good Time, Call, Magnolia, The Shawshank Redemption, Under the Tuscan Sun, National Treasure, Hannibal, Air Force One, and The Congress.

His TV credits include Sorry For Your Loss, Mom, Supernatural, Castle, Justified, The Newsroom, 24, Northern Exposure, Franklin & Bash, NCIS, Private Practice, Parks and Recreation, Boston Legal, Grey's Anatomy, Dexter, Seinfeld, Frasier, Nip/Tuck, The Closer, CSI, Party of Five, Mad About You, Ally McBeal, Star Trek: Voyager, Malcolm in the Middle, Forever (2014 TV series), Dr. Quinn, Medicine Woman, and ‘’The Rookie’’