Kjetil-Vidar Haraldstad (stage name Frost; born 28 June 1973) is a Norwegian drummer in the black metal bands Satyricon and 1349.

Frost was denied entry to North America by the US Department of Homeland Security [clarification needed] upon failing to note his having been sentenced to 5 months in jail for assault (during a bar fight in the early '90s) when applying for his work visa.

Joey Jordison and Trym Torson have performed with Satyricon on North American tour dates.

[9] He appeared in the documentary film Until The Light Takes Us as part of an art piece by Norwegian artist Bjarne Melgaard, featuring him firebreathing, cutting himself with a knife, and destroying the set.

He says that he has shown appreciation for good food and believes it will be the future in terms of what humans consume on a daily basis.