Ólafur Arnalds (Icelandic pronunciation: ​; 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 / 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.