Berit Nøkleby (born 25 September 1939) is a Norwegian historian.
She was born in Drammen, and is a cand.philol. by education. She has contributed to several books on the German occupation of Norway. She wrote book II and IV of the series Norge i krig I–VIII. Fremmedåk og frihetskamp 1940–1945 (II: Nyordning, 1985, and IV: Holdningskamp, 1986). She wrote the book Josef Terboven. Hitlers mann i Norge (1992), and she was co-editor of the encyclopaedia Norsk Krigsleksikon 1940–1945 (1995).