David Bowditch Morse (born October 11, 1953) is an American actor. Morse became widely known for his role as Dr. Jack "Boomer" Morrison in the NBC medical drama series St. Elsewhere (1982–88). Some other notable roles are in The Negotiator, The Good Son, Horns, Contact, The Green Mile, Dancer in the Dark, Disturbia, The Hurt Locker, The Long Kiss Goodnight, The Rock and 12 Monkeys.

In 2006, he had a recurring role as Detective Michael Tritter on the medical drama House for which he received an Emmy Award nomination. He portrayed George Washington in the 2008 HBO Miniseries John Adams, which garnered him a second Emmy nomination. He has received acclaim for his portrayal of Uncle Peck on the Off-Broadway play How I Learned to Drive for which he earned a Drama Desk and Obie Award. He also had success on Broadway, portraying James "Sharky" Harkin in The Seafarer. From 2010 to 2013, he portrayed Terry Colson, an honest police officer in a corrupt New Orleans police department, on the HBO series Treme. Morse appeared in the WGN America series Outsiders (2016–17), the Showtime miniseries Escape at Dannemora (2018), the Netflix comedy drama series The Chair (2021), and the Apple TV mystery series The Last Thing He Told Me (2023-2026).