The Isdal Woman (Norwegian: Isdalskvinnen, c. 1930–1945 – November 1970) is a placeholder name given to an unidentified woman who was found dead at Isdalen ("The Ice Valley") in Bergen, Norway, on 29 November 1970.

Although police at the time ruled a verdict of likely suicide, the nature of the case encouraged speculation and ongoing investigation in the years since. Half a century later, it remains one of the most profound cold case mysteries in Norwegian history.