Kristofer Oliver Uppdal (19 February 1878 – 26 December 1961), born Opdal, was a Norwegian poet and author, born in Beitstad, Nord-Trøndelag. As a boy, Uppdal worked as a shepherd, and later as a miner and construction worker. In 1907 he started working for Norsk Hydro, and came to their factory in Rjukan in 1910-1911. In 1905, he debuted with Ung sorg (Young sorrow) and Kvæde (Songs), collections of poetry, followed by Sollaug in 1908, and Villfuglar (Wild birds) in 1909.