James "Jimmy" Deuchar (26 June 1930 – 9 September 1993) was a jazztrumpeter and big band arranger, born in Dundee, Scotland. He found fame as a performer and arranger in the 1950s and 1960s. Deuchar was taught trumpet by John Lynch, who learned bugle as a boy soldier in the First World War and who later was Director of Brass Music for Dundee.
He returned to the UK and worked again with Scott (1960-62) and with Tubby Hayes (1962-66). As a highly gifted player and a leading exponent of the “modern” style, he was in some demand and achieved success as a touring player in Europe and the United States. He also “sat in” with leading American players at Ronnie Scott's club as musical exchanges were liberalised at the start of the sixties.
He returned to work with Edelhagen in 1966. Also during the sixties and early seventies, he worked with The Kenny Clarke-Francy Boland Big Band, a big band featuring leading European and ex-patriate American musicians. He returned to London around 1971, working freelance, and then to Dundee in the mid-1970s. He continued to arrange, play and guest in a number of settings, including the BBC Big Band in London and the BBC Scottish Radio Orchestra in Glasgow until his health deteriorated. He died in 1993, aged 63.