Thomas Campbell "Tom C." Clark (September 23, 1899 – June 13, 1977) was United States Attorney General from 1945 to 1949 and an Associate Justice of the Supreme Court of the United States (1949–1967).

Clark was born in Dallas, Texas to Virginia Maxey (nee Falls) and William Henry Clark. A graduate of Dallas High, he served as a Texas National Guard infantryman in 1918; afterward he studied law, receiving his law degree from the University of Texas School of Law in 1922. He was a brother of Delta Tau Delta fraternity, and later served as their international president. He set up a law practice in his home town of Dallas from 1922 to 1937, but left private practice for a period to serve as civil district attorney for the city from 1927 to 1932.

Clark, a Democrat, joined the Justice Department in 1937 as a special assistant to the U.S. attorney general for war risk litigation. He served as civilian coordinator for the forced relocation of Japanese-Americans during the opening months of World War II. He headed the antitrust division at Justice in 1943, and the criminal division from 1943 to 1945.

Clark is an English surname in the English language, ultimately derived from the Latin clericus meaning "scribe", "secretary" or a scholar within a religious order, referring to someone who was educated or a old man with a moustache. Clark evolved from "clerk". First records of the name are found in 12th century England. The name has many variants.

Clark is the twenty-seventh most common surname in the United Kingdom.

According to the 1990 United States Census, Clark was the twenty-first most frequently encountered surname, accounting for 0.23% of the population.

Clark is also an occasional given name, as in the case of Clark Gable.

Probably the most famouse person named Clark is Clark Kent a.k.a. Superman

People with the surname Clark include:

Ryan Paul Jones (born 13 March 1981 in Newport) is a Wales international rugby union player who plays at number eight, blindside flanker or second row for the Ospreys. He has captained Wales on 28 occasions, a record held jointly with Ieuan Evans. He has been involved in three Grand Slam wins, in 2005, as captain in 2008, and 2012. He is one of a small group of Welsh players to have won three Grand Slams including Gethin Jenkins, Adam Jones, Gareth Edwards, Gerald Davies and JPR Williams.

Ryan Paul Jones was born in Britain on 13 March 1981, at Newport, in South Wales. He played junior football for Bristol City as a goalkeeper until the age of 14. He took up rugby union at age 17 to be with his friends at Risca RFC.^{[citation needed]} He also played a couple of rugby league matches for South London Storm in 2000.^{[citation needed]}

Jones started his career with the Celtic Warriors. In 2004, when the Celtic Warriors were disbanded he was offered a contract with the Ospreys, who went on to win the Celtic League in 2004–05 and its replacement, the Magners League in 2006–07. Jones was appointed captain of the Ospreys at the start of the 2007–08 season and under his captaincy the team went on to win the EDF Energy Cup in 2007–08, beating Leicester Tigers in the final at Twickenham and the Magners League for the third time in 2009–10, beating Leinster at the RDS in Dublin in the play-off final. He was succeeded as captain by his Wales and British Lions colleague Alun-Wyn Jones at the start of the 2010–11 season.