Paul Douglas Hillier OBE is an English conductor, music director and baritone. He specializes in both early and contemporary classical music, especially that by composers Steve Reich and Arvo Pärt. He was a co-founder of the Hilliard Ensemble as well Theatre of Voices, and directed the Estonian Philharmonic Chamber Choir for many years. He has been Chief Conductor of Ars Nova, and Artistic Director and Chief Conductor of Chamber Choir Ireland since 2008.