Willem Rebergen (born 12 September 1985), better known by his stage name Headhunterz, is a Dutch DJ and music producer. Rebergen is also a voice actor. He has done dubbing for several movies and TV series. He started his career in 2005 working on Hardstyle music.

Headhunterz has performed at Qlimax, Defqon.1, Q-Base, In Qontrol, Decibel, Hard Bass, Electric Daisy Carnival and Tomorrowland.

Headhunterz released his work on Scantraxx through his own sub-label, Scantraxx Reloaded, but in 2013 he started his own record label, "HARD with STYLE". He signed with the North American electronic dance record label Ultra Music in 2013 and left his own label in 2015. Since June 2017, he officially returned to the Hardstyle community at the closing ceremony of Defqon.1 Weekend Festival 2017.

In 2018, Headhunterz and fellow DJ Wildstylez started a new Hardstyle label called: "Art of Creation".