Gunnar Hansen Horn (25 June 1894 – 15 July 1946) was a Norwegian petroleum geologist and Arctic explorer. He is most renowned as the leader of the Bratvaag Expedition that found the long-lost remains of S. A. Andrée's Arctic balloon expedition of 1897 at Kvitøya in 1930. The headland Hornodden of Kvitøya is named after him.