Julian Barratt Pettifer (born 4 May 1968) is an English comedian, actor and musician. As a comedian and comic actor, he is known for his use of surreal humour and black comedy. During the 2000s he was part of The Mighty Boosh comedy troupe alongside comedy partner Noel Fielding.

Born in Leeds, West Yorkshire, Barratt attended the University of Reading and first performed stand up comedy whilst at the University of Reading. In 1997 he first met Mighty Boosh collaborator Noel Fielding when they both appeared on the same comedy bill at a pub in north London. Sometime in around 1998 they then performed their first comedy show together in London which was a mix of both stand up and sketch comedy and then in 1998 they took the show, The Mighty Boosh, to the Edinburgh fringe festival and returned again in 1999 with Arctic Boosh and in 2000 with Autoboosh. In 2001 The Mighty Boosh became a six-part radio show on BBC London Live, called The Boosh later transferring to BBC radio 4. This was followed by the television show The Mighty Boosh, which ran for three series on BBC Three from 2004 to 2007. The show generated a cult following and won a variety of awards. From February to April 2006 they went on tour around the UK with the stage show The Mighty Boosh Live and then toured the UK for a second time from September 2008 to January 2009 with The Mighty Boosh Live: Future Sailors Tour.

Alongside Fielding, he has starred in Unnatural Acts, Nathan Barley and Garth Marenghi's Darkplace. Barratt also co-wrote and starred in the 2017 film Mindhorn. He starred in the Channel 4 black comedy-drama sitcom Flowers.