John Kenneth Wetton (12 June 1949 – 31 January 2017) was an English musician, singer, and songwriter. Known for his dexterous bass playing and booming baritone voice, Wetton first gained fame in the early 1970s, when he joined King Crimson.

Wetton was later the singer and principal songwriter of the supergroup Asia, which proved to be his biggest commercial success. The debut Asia album sold ten million copies worldwide, and was Billboard magazine's number one album of 1982. He also performed with many other progressive rock and hard rock bands, including U.K., Family, Roxy Music, Uriah Heep and Wishbone Ash.

He later formed the duo Icon with his Asia band mate (and songwriting partner) Geoff Downes. From the 1990s he had a successful solo career. Wetton signed his name with his left hand but played bass right handed