Heavy MTL is a two-day heavy metal and hard rock festival in Montreal, Quebec, at Parc Jean-Drapeau on Île Sainte-Hélène held in the summer. The 2008 edition attracted a crowd of around 36,000 people.
Artists who played at the inaugural Heavy MTL festival include: Iron Maiden, Mötley Crüe, Megadeth, DethKlok, Mastodon, Symphony X, 3 Inches of Blood, Anthrax, KoRn, Slayer and many more.