Wenche Elizabeth Arntzen (born 26 June 1959) is a Norwegian lawyer and judge. She was appointed to the Supreme Court of Norway on 20 June 2014, having previously been a judge at the Oslo District Court. From 16 April until 22 June 2012, she presided over the trial of Anders Behring Breivik following the 2011 Norway attacks, assisted by district court judge Arne Lyng and three lay judges.