Others
- James Watson (actor) (born 1970), a British movie and TV actor
- James Watson (engraver) (c. 1739–1790), an Irish engraver
- James Watson (New York) (1750–1806), a U.S. Senator from New York State
- James Watson (radical) (1799–1874), English publisher, activist, and Chartist
- James Watson (soldier) (born 1850), an American soldier who fought in the "Battle of Little Bighorn"
- James Watson (trumpeter), a British trumpet player, conductor, and professor at the Royal Academy of Music
- James Watson (wrestler), a professional wrestler with the pseudonym "Mikey Whipwreck"
- James Watson (author) (born 1936), an author from Lancashire, England
- James A. Watson (born c. 1956), a rear admiral in the U.S. Coast Guard
- James Cameron Watson (born 1891, death unknown), a Canadian politician, the Mayor of Calgary for a period of time
- James Eli Watson (c. 1864–1948), a U.S. Congressman and Senator from Indiana
- James F. Watson (1840–1897), an American attorney and judge
- James Lopez Watson (1922–2001), a U.S. Federal judge, first black judge to head a federal court in the South
- James S. Watson (1882–1952), the first black judge elected in New York State
- James Watson (MP) (1817–1895), English merchant, dairy herdsman, and Conservative politician, House of Commons 1885–92
- James Watson (British Army officer), the Commander-in-Chief in India
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