Sigurd Simensen (19 February 1888 – 1969) was a Norwegian newspaper editor and politician for the Labour and Communist parties. He was born in Vestfossen. He started his career as an iron and metalworker, working at Thunes Mekaniske Verksted. He first joined the Union of Iron and Metalworkers in 1907, and was politically organized from 1908. He became a leading member of , and was elected to their central board in 1916. He became subeditor of their newspaper Klassekampen in 1917. In 1918 he was elected to the Labour Party central board, and was hired as travelling secretary for Northern Norway. He also chaired the national association of worker's councils which sprang up in the same year, post-Russian Revolution.