Andy Diagram (born London 1959) is a British musician and trumpet player. He has worked with the instrument in a variety bands and contexts ranging from pop and rock to experimental jazz, art rock and dance music. He is best known for his work with James (having been a member from 1989 to 1992 during the band's popular peak in the UK, and rejoining for the ongoing band reformation in 2007), with Spaceheads and with the Pere Ubu singer David Thomas.