Richard Emsley (born December 1951 in Goole, Yorkshire) is a British composer, sometimes associated with the New Complexity school. Emsley initially studied with Arnold Whittall at University College, Cardiff, after which he moved to London, where he still lives. He attended Peter Maxwell Davies' composition classes at the Dartington Summer School of Music, and co-founded the Cardiff Composers' Ensemble while a student there. In the 1970s he co-founded, with James Clarke, the ensemble , which specialised in performances of music by contemporary composers, including Iannis Xenakis, Michael Finnissy and James Dillon.