Ólafur Arnalds (Icelandic pronunciation: ​[ˈouːlavʏr ˈartnalts]; born 3 November 1986) is an Icelandic multi-instrumentalist and producer from Mosfellsbær, Iceland. He mixes strings and piano with loops and beats, a sound ranging from ambient/electronic to atmospheric pop. He is also the former drummer for hardcore and metal bands Fighting Shit, Celestine, and others.

In 2009, Ólafur also formed an experimental techno project, entitled Kiasmos, with Janus Rasmussen from the Icelandic electro-pop band Bloodgroup, announcing his electronic debut album in 2014.