"Ain't No Doubt" is a song by English actor and singer-songwriter Jimmy Nail, released on 29 June 1992 by EastWest as the first single from his second album, Growing Up in Public (1992).

[5] Tom Ewing of Freaky Trigger felt it's a "one-of-a-kind meeting of pub rock and swingbeat: ruminative, finger-pointing spoken passages broken up by a two-fisted funk chorus that lunges at you like a closing time drunk."

"[6] Dave Sholin from the Gavin Report commented, "A full-blown pop production with a rhythmic groove provides this artist, voted England's "sexiest man", with dynamic material.

"[8] Pan-European magazine Music & Media noted that from BBC detective series Spender actor Nail "has now started spending time on the top slot in the UK singles chart.

[10] "Ain't No Doubt" is Nail's most successful hit worldwide, peaking at number one in Ireland and the United Kingdom, as well as reaching the top 10 in Australia, Belgium, Denmark, the Netherlands, New Zealand, and Sweden.