Karl Sigwald Johannes Bull (30 June 1860 – 27 December 1936) was a Norwegian military officer and politician for the Conservative Party.

He was born on 30 June 1860, in Kristiania, the son of military officer and politician Anders Sandøe Ørsted Bull and his wife Caroline Elisabeth Dahl.

[3] From 1905, Bull held the rank of lieutenant colonel in the army, and at the Negotiations in Karlstad in the same year, he was present as a Norwegian military representative.

[1] On 2 February 1910, when the cabinet Konow assumed office, Bull was appointed as the new Minister of Defence.

In 1911, he had been promoted to colonel and chief of the Fourth Infantry Regiment of East Akershus.