Alistair Ian Campbell (born 15 February 1959) is an English singer and songwriter who was lead singer and co-founder of the British reggae band UB40.

UB40 sold more than 70 million records worldwide and toured for 30 years with the original line-up of the band. In 2008 Campbell and keyboard-player Mickey Virtue left UB40 due to a dispute with band management and teamed up in a new band. In August 2014, Campbell announced he had reunited with former UB40 bandmate Astro, who also left due to management disputes and the musical direction of the band. Campbell then formed a new UB40 featuring the three bandmates.