John Schuck (born February 4, 1940 in Boston, Massachusetts) is an American character actor.
John Schuck made his first theatrical appearances at Denison University, and after graduating continued his career at the Cleveland Playhouse, the Baltimore Center Stage, and finally the American Conservatory Theater, where he was discovered by Robert Altman.
His first appearance in film was the role of Captain Walter Koskiusko "Painless Pole" Waldowski in the film M*A*S*H (1970).
From 1971-1977 he appeared as Sergeant Charles Enright in McMillan and Wife and also starred as an overseer in the popular mini-series Roots.
In 1986, Schuck took the role of a Klingon ambassador in Star Trek IV: The Voyage Home. He reprised the role in 1991, in Star Trek VI: The Undiscovered Country, becoming one of only three guest roles to appear in more than one Star Trek film (the others being the characters of Saavik and Fleet Admiral Cartwright).
He also guest starred in Star Trek: Deep Space Nine, Star Trek: Voyager and Star Trek: Enterprise.
He has since appeared in the films Holy Matrimony (1994), and String of the Kite (2003).