Hilma Nikolaisen (born 1. July 1982 at Moi) is a Norwegian musician living in Oslo. Nikolaisen is the sister of Emil, Ivar and Elvira Nikolaisen. She plays bass guitar in the band Serena Maneesh and is a vocalist in the trio Umbrella. She was previously a member of the band Loch Ness Mouse.
She has a son with former Mayhem-vocalist Sven Erik Kristiansen.