John Watson may refer to:
- John B. Watson (1878–1958), psychologist pioneer of behaviorism
- John Christian Watson (1867–1941) Australia's third Prime Minister
- John C. Watson (1842–1923), admiral of the United States Navy
- John Fox Watson, believed to be the only Scottish football player in Real Madrid's history
- John Hugh Adam Watson, British international relations theorist and researcher, former British ambassador to Senegal and Cuba
- John L. Watson (born 1951), chess player and author
- John Watson (American artist), American artist and sculptor
- John Watson (artist), British artist and comicbook artist
- John Watson (Australian politician) (born 1937), former Australian Senator
- John Watson (Bishop) (1520–1584), Bishop of Winchester
- John Watson (football player) (born 1949), former NFL offensive lineman
- John Watson Gordon (1788–1864), Scottish painter
- John Watson (officer of arms), Bluemantle Pursuivant
- John Watson (racing driver) (born 1946), British Formula One driver
- John Watson (UK MP)
- John Watson (Vice-Chancellor), vice-chancellor of Cambridge University, 1518–1519 and 1530–1531
- John W. Foster (1836–1917), American military officer, journalist and diplomat
- John Watson (VC) 1829–1919), recipient of the Victoria Cross
- Johnny "Guitar" Watson (1935–1996), American blues guitarist
- Fictional
- John H. Watson, known as Doctor Watson (1852–1930?), fictional sidekick of detective Sherlock Holmes
- John Watson, known as Wonko the Sane, character from the novel So Long, and Thanks For All the Fish by Douglas Adams
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