Heatwave was a rock festival held on August 23, 1980 at Mosport Park north of Bowmanville, Ontario. The slogans used to promote the show were variously the "Punk Woodstock", the "New Wave Woodstock", or "The 1980s Big Beat Rock and Roll Party". The festival was noteworthy because of the importance of the headliner bands that played and the timing in the evolution of new wave music, and the size of the crowd.