Hildur Ingveldar Guðnadóttir (born 4 September 1982) is an Icelandic musician and composer.
A classically trained cellist, she has played and recorded with the bands Pan Sonic, Throbbing Gristle, Múm and Stórsveit Nix Noltes, and has also toured with Animal Collective and Sunn O))).
She has additionally produced solo works.
Hildur has gained international recognition due to her film scores, including for the action thriller film Sicario: Day of the Soldado (2018), the HBO drama miniseries Chernobyl (2019), and the psychological thriller film Joker (2019).