Carl Jacob Arnholm (18 December 1899 – 15 September 1976) was a Norwegian jurist. He was born in Oslo as a son of civil servant Carsten Johannes Andersen (1865–1950) and Gunvor Henriksen (1866–1940). He finished his secondary education in Kristiania in 1917, and graduated with the cand.jur. degree in 1921. After one year as deputy judge he worked as a junior solicitor from 1923. From 1927 he was entitled to work with Supreme Court cases. In 1930 he was hired as research fellow at the Royal Frederick University, and took the dr.juris degree already in 1931, on the thesis Betingelsene for testamenters gyldighet efter norsk rett. He was then a professor from 1933 to 1968. He served as dean of the Faculty of Law from 1945 to 1951, and in the same period he was deputy chairman of the university