Olaf Olsen (born 8 August 1976) is a Norwegian musician, known as the drummer of BigBang (1999–May 2000, May 2001–current)[1][2][3][4] with whom he has remained the longest after frontman Øystein Greni.

Singer and guitarist Øystein Greni would often take place behind the drums, and both Martin Horntveth (of Jaga Jazzist) and Christian Syvertsen (January–April 1999) did not stay long.

[5] Christensen explains, "I subsequently spent endless difficult nights listening through the applications but before choosing between them, but before I had to decide, one of my friends told me about a drummer who had just left his Norwegian band BigBang, which seemed a fantastic opportunity to me.

During the song Surfing the Surface, Olsen would often play on a miniature short-neck Fender Stratocaster, which strongly contrasted with his appearance.

In 2014 Olsen replaced Thomas Strønen in the band Needlepoint and performed with them on the album Aimless Mary and at the 2016 Nattjazz in Bergen.