Joe Christie, better known as Braintax, is a British rapper and record producer. Christie had also recorded or appeared under the pseudonyms Brando Flux and Joey Brains. All of his releases were on his own record label, Low Life Records.

Originally Braintax was a duo, consisting of Christie and DJ Test who also contributed vocals and production. Test departed following the 1997 release of the Future Years EP and Christie retained the Braintax name; it has since become synonymous with him as a solo artist. On the track "Monsoon Funk" on Panorama, Christie explained Braintax means "we can all get busy if we use our brains." Braintax's lyrics have made multiple references to spirituality, healthy eating, the state of hip hop music, environmentalism, and politics. On Mr. Scruff's 2002 album Trouser Jazz, Braintax was featured on the song "Vibrate".

In 2008, Braintax suddenly announced his retirement with the release of his final album titled My Last And Best Album and also the end of Low Life Records.