Belsonic is a small music festival which takes place at Custom House Square in Belfast, Northern Ireland. The festival began in 2008 and the capacity for the event is 5,000. Belsonic has taken place over 3 or 4 days in August.
In 2008-2009 the festival took place over three days and 2010 to present, over 4 days. The music policy is a mixture of dance, indie and pop.
Headliners to have graced the stages at Belsonic include Vampire Weekend, Canadian duo Crystal Castles, Irish contingent Two Door Cinema Club, BRIT award winning Florence and the Machine, Mod King Paul Weller and many more.