Peter Cusack is an English artist and musician who is a member of CRiSAP (Creative Research in Sound Arts Practice), and is a research staff member and founding member of the London College of Communication in the University of the Arts London. He was a founding member and director of the London Musicians' Collective.

He is best known as a member of the avant garde musical quartet, Alterations (1978–1986; with Steve Beresford, David Toop, and Terry Day), and the creator of field and wildlife recording-based albums including:

Where Is the Green Parrot? (1999) with tracks like "Toy Shop (Two Small Boys Go Shopping)" and "Siren", which are just as advertised. Day for Night (2000), with Max Eastley. This features "duets" between Eastley's kinetic sculpture and Cusack's field recordings. Baikal Ice (2003), featuring tracks like "Banging Holes In Ice" and "Floating Icicles Rocked By Waves" and "Falling In".

Cusack has been involved in a wide range of projects throughout his career. Several of his pieces have been reviewed in Leonardo Music Journal, the annual music Journal published by MIT Press. He has also curated an album for Leonardo Music Journal.

He is currently research fellow on the Engineering and Physical Sciences Research Council's multidisciplinary 'Positive Soundscapes Project'.