Claus Norreen (born 5 June 1970) is a Danish musician known for being a part of the pop band Aqua, which sold around 33 million records.

Hence, he bought a keyboard and started playing industrial techno.

When he finished school he started to work in his sisters' clothing store.

In 1989, he met Søren Rasted and moved his music instrument to his residence.

Claus married Danish journalist Siggy Norreen (née Madsen) in 2001.