Carl Severin Bentzen, often called C. S. Bentzen (13 September 1882 – 1956) was a Norwegian tailor and politician for the Labour and Social Democratic Labour parties. He was a son of tailor Wilhelm Julius Bentzen (1855–1911) and Sofie Nilson (1859–1936), and learned the trade from his father. He studied further in Kristiania, Copenhagen and Berlin. He completed his Gesellenprüfung in 1904, and acquired burghership in Hønefoss in 1911. He had joined the labour movement in 1904, and was a member of the executive committee of Hønefoss city council from 1910 to 1922, serving as mayor from 1913 to 1915. He founded the first trade union in Ringerike, in 1903, and was also involved in the temperance movement as the county leader of .