Politics
- John Watson (16th century MP), Member of Parliament for Morpeth, Newcastle upon Tyne and Berwick-upon-Tweed
- Chris Watson (John Christian Watson, 1867–1941), Australia's third Prime Minister
- John Bertrand Watson (1878–1948), British Member of Parliament for Stockton-on-Tees, 1917–1923
- John S. Watson (US politician) (1924–1996), African-American Democratic Party politician in New Jersey
- John Watson (Australian politician) (born 1937), former Australian Senator
- John Watson (British politician) (born 1943), British Member of Parliament for Skipton, 1979–1989
- John William Clark Watson (1808–1890), Confederate politician and judge
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