Gerhard Fischer (12 July 1890 – 10 September 1977) was a Norwegian architect and archaeologist.

He was the son of architect Adolph Fischer (1844–1925) and Dorothea Margaretha Elisabeth Wilcken (1857–1943).

Fischer studied at the Bergen Technical School (Bergens Tekniske Skole), the Norwegian National Academy of Craft and Art Industry (Statens håndverks- og kunstindustriskole) in Oslo and the Royal Danish Academy of Fine Arts (Det Kongelige Danske Kunstakademi) in Copenhagen.

From 1938 until 1960, he was employed as a conservator at Universitetets Oldsaksamling, now part of Museum of Cultural History in Oslo.

He chaired several excavations of sites dating from the Middle Ages in Norway including Sverresborg in Trondheim and the Bergenhus Fortress in Bergen.