John Wetton (born July 17, 1949 in Derbyshire, England) is a British singer, bassist and guitarist. He has been a professional musician since the late 1960s, and has been a member of the groups Mogul Thrash , Family , King Crimson, Roxy Music/Bryan Ferry band, Uriah Heep, UK and Asia. Wetton is now a solo performer, having left Asia for a second time in 1992.

Wetton was initially known for his powerful bass guitar sound and improvisational abilities (as evidenced on King Crimson's The Great Deceiver live box set and other sources), although his recorded output since at least 1980 has been more commercially-oriented. He seldom plays bass guitar these days, instead favouring a singer-songwriter approach that frequently highlights the use of acoustic guitar.

Wetton's recorded highlights include King Crimson's Larks' Tongues In Aspic (1972), UK's self-titled album (1978) and Asia's self-titled album (1982), the last of which was the biggest seller of his career.