John Terrence Clark (real name John Terrence Kelly) is a fictional character created by Tom Clancy who appears in many of Clancy's novels. He is an Irish American Catholic.

John Clark (February 1 1761 – August 14 1821) was an American farmer and politician from Blackbird Hundred in New Castle County, Delaware, near Smyrna. He was a member of the Federalist Party, who served in the Delaware General Assembly and as Governor of Delaware.

John Clark (born March 13, 1941) is a former Scottish footballer and member of the Lisbon Lions.

John Clark was born in London, England, on All Saint's Day, November 1, 1932, and is perhaps best known now as the ex-husband of Lynn Redgrave, who divorced him December 22, 2000, after 32 years of marriage.

John Clark (February 28, 1766 – October 12, 1832) was an American politician.

John Clark is an American jazz horn player and composer.