Simon Holt (born 21 February 1958) is a British composer.
Holt was born in Bolton and educated at Bolton School. Shortly after graduating from the Royal Northern College of Music, he became firmly established on the new music circuit with a series of commissions and fruitful collaborations with the London Sinfonietta and the Nash Ensemble. Influenced by Messiaen, Xenakis and Feldman as well as visual artists such as Goya, Alberto Giacometti and Brâncuși, his music is complex, dramatic and often enigmatic. The intricate internal structures of his works are concealed by a seemingly impulsive nature. During the 1980s he worked primarily in complex soundworlds, while since the 1990s the dense textures have often been offset by Feldmanesque moments of calm, that Holt refers to as ‘still centres’.