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 100 million records worldwide and toured for 30 years with the original lineup of the band. In 2008, Campbell left UB40 due to a dispute with band management, alongside Mickey Virtue (Keyboard) also left for the same reasons and teamed up with Ali in the 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 UB40 Featuring Ali, Astro & Mickey.