Rasmus Otto Mønsted (23 November 1838 - 4 September 1916) was an industrialist and margarine manufacturer from Denmark. Born at the rural family manor of Lyngsbækgård on Mols near Ebeltoft, Otto Mønsted became a wholesaler of butter, grain and feed in the town of Aarhus in 1865 after some trading experience in Grenå, Roskilde and Copenhagen. In 1876, he founded a large business exporting butter in hermetically sealed containers to places like England, China and Africa. Although the butter company was successful, he diversified into manufacturing margarine, and in 1883 opened the first margarine factory in Denmark. He followed five years later with a factory in Godley, near Manchester, England, and in 1894 he built a vast margarine works in Southall, London. Mønsteds butter company was rena