Johan Cappelen (25 February 1889 – 18 October 1947) was a Norwegian lawyer and politician for the Conservative Party. He was born in Skogn as a son of physician Johan Christian Severin Cappelen (1855–1936) and Katharina M. Steen (1859–1915). He had one sister and one brother. He was a nephew of physician Axel Hermansen Cappelen. He graduated from the Royal Frederick University with cand.jur. degree in 1911. He worked as a deputy judge, and from 1915, attorney in Trondhjem. He was barrister with access to work with Supreme Court from 1922.