Wenche Elizabeth Arntzen (born June 26, 1959) is a Norwegian lawyer and judge with a distinguished career in Norway's judiciary. She served as a judge at the Oslo District Court, where she gained international prominence for presiding over the 2012 trial of Anders Behring Breivik, the perpetrator of the 2011 Norway attacks that resulted in 77 deaths. On June 20, 2014, she was appointed to the Supreme Court of Norway, a position she continues to hold. Her role in the high-profile Breivik trial highlighted her expertise in criminal law and commitment to impartial justice amid intense public scrutiny. Throughout her career, she has been recognized for her work in both civil and criminal matters, contributing to the integrity of Norway's judicial system.