Hammersonic Festival is an annual international rock and metal music festival held in Jakarta, Indonesia since 2012. This festival is known as the largest metal festival in Southeast Asia, which features a variety of metal bands from all over the world. Since its inception, the festival has featured international artists such as; Slipknot, Lamb of God, Megadeth, Bullet for My Valentine, As I Lay Dying, Epica, Kreator, Trivium and others.
In 2023, the festival is held by approximately 140,000 audiences, which around 20-25% of those are from abroad.