VOA – Heavy Rock Festival (formerly VOA Fest and Vagos Open Air) is an open-air heavy metal/hard rock festival held annually in Lisbon, Portugal. The festival is being held since 2009 in four different locations: the first four editions, from 2009 to 2012, were held in Calvão (a small town in the municipality of Vagos, near Aveiro), the next three (2013 to 2015) were held in the town of Vagos, the following two editions (2016 and 2017) were held in Corroios, a city in the municipality of Seixal, and after a year break the festival is scheduled to return in 2019 in Lisbon. It is organized by Prime Artists, a Portuguese event promoter.