Defqon.1 Weekend Festival is an annual music festival held in the Netherlands. In the past, it was also held in Chile and Australia. Founded in 2003 by festival organizer Q-dance, the festival plays mostly hardstyle and related genres such as hardcore, early and classic.

Q-dance is a Dutch company that organizes events and festivals that focuses on the harder styles of dance music – mainly hardstyle, hardcore, and hard trance. Popular events and festivals organized by Q-dance are Defqon.1 Festival, Qlimax, Qapital, Impaqt, EPIQ, and X-Qlusive. The events of Q-dance are easily identified by the letter “Q” on the event names. The logo of Q-dance is inspired by the knobs on DJ mixers, which if turned 120 degrees to the right creates the letter “Q”.