Guy Jeffrey Barker MBE (born 26 December 1957) is an English jazz trumpeter and composer. Barker was born in Chiswick, London, the son of an actress and a stuntman. He started playing the trumpet at the age of twelve, and within a year had joined the National Youth Jazz Orchestra. At the age of 15 he was playing with the Crouch End Allstars along with Wally Fawkes and Bob Nadkarni.
Barker was a member of Clark Tracey's quintet from 1984 to 1992. As a sideman he has played with Ornette Coleman, Carla Bley, Georgie Fame, James Carter, Mike Westbrook, Frank Sinatra, Colin Towns, Natalie Merchant, ABC, The The, Haircut One Hundred, Erasure, Chris Botti, Wham!, Kajagoogoo, The Housemartins, Matt Bianco, Alphaville, The Style Council, The Moody Blues, Sting, Bucks Fizz, Mike Oldfield, Cleo Laine, Acoustic Alchemy, XTC, and Stan Tracey.
Previously, his own band has featured an international mix of musicians – Perico Sambeat (alto saxophone; Spain), Bernardo Sassetti (piano; Portugal), Geoff Gascoyne ([bass, United Kingdom), and Gene Calderazzo (drums; United States)
More recently he has toured the Guy Barker Jazz Orchestra – a 15 piece big band featuring Rosario Giuliani (alto saxophone; Italy) and Per Johansson (tenor saxophone; Sweden) – performing DZF, a reworking of Mozart's Magic Flute with Michael Brandon narrating the story as a Raymond Chandler-style novel, retold by Robert Ryan.
Barker was music director and arranger for the opening gala concert "Jazz Voice: Celebrating a Century of Song" at the London Jazz Festival annually from 2008 to 2014. He was also music director and arranger on a number of BBC Radio 2 Friday night is music night shows featuring the Guy Barker Jazz Orchestra with the BBC Concert Orchestra, celebrating the music of Billie Holiday / Duke Ellington and Billy Strayhorn / Ella Fitzgerald, Aretha Franklin and Dusty Springfield/ Jazz Royalty to celebrate the Wedding of William and Kate