| Otto Bahr Halvorsen | |
| Office: | 14th Prime Minister of Norway |
| Termstart: | 21 June 1920 |
| Termend: | 22 June 1921 |
| Termstart2: | 6 March 1923 |
| Monarch2: | Haakon VII |
| Preceded: | Gunnar Knudsen |
| Succeeded: | Otto Blehr |
| Preceded2: | Otto Blehr |
| Party: | Conservative |
| Birth Date: | 28 May 1872 |
| Death Place: | Christiania, Norway |
| Birth Place: | Christiania, United Kingdoms of Sweden and Norway |
| Termend2: | 23 May 1923 |
| Succeeded2: | Abraham Berge |
| Office3: | Minister of Justice |
| Term Start3: | 21 June 1920 |
| Term End3: | 22 June 1921 |
| Primeminister3: | Himself |
| Predecessor3: | Otto Blehr |
| Successor3: | Olaf Amundsen |
| Term Start4: | 6 March 1923 |
| Term End4: | 23 May 1923 |
| Primeminister4: | Himself |
| Predecessor4: | Arnold Holmboe |
| Successor4: | Christian L. Rolfsen |
| Office5: | Leader of the Conservative Party |
| Term Start5: | 1919 |
| Term End5: | 23 May 1923 |
| Predecessor5: | Jens Bratlie |
| Successor5: | Ivar Lykke |
Otto Bahr Halvorsen (28 May 1872 - 23 May 1923) was a Norwegian lawyer and politician from the Conservative Party, who served as the 14th prime minister of Norway from 1920 to 1921 and again in 1923 up until his death in office.[1]
Halvorsen was born in Kristiania (now Oslo, Norway) to Otto Hellen Halvorsen (1840–1921) and Karine Christine Christiansen (1847–1927). He attended Kristiania Cathedral School. He studied law at the University of Kristiania where he completed his examen artium in 1890. As a licensed attorney, in 1904 he opened a law firm in Kristiania.[2]
In 1912 Halvorsen was first elected to the Storting from the neighborhood of Gamle Aker in the district of St. Hanshaugen in Kristiania. Halvorsen served Kristiania in the Parliament from the Conservative Party from 1913 to 1923. He became Prime Minister during 1920 while also serving as Minister of Justice. He again became Prime Minister in May 1923 while simultaneously serving as Minister of Justice. Between these terms, Halvorsen was leader of the Conservative Party in Parliament and President of the Storting (stortingspresident).[3] [4]
In 1899, he was married to Kathrine Hofgaard (1875–1960), daughter of Simon Wright Hofgaard and Ida Mathilde Aars.[5]