Theodor Bull was a Norwegian businessperson and genealogist.

He was born in Kristiania

Oslo

Oslo is a municipality, as well as the capital and most populous city in Norway. As a municipality , it was established on 1 January 1838. Founded around 1048 by King Harald III of Norway, the city was largely destroyed by fire in 1624. The city was moved under the reign of Denmark–Norway's King...

 as a son of medical doctor Edvard Isak Hambro Bull (1845–1925). He was a brother of theatre director Johan Peter Bull

Johan Peter Bull

Johan Peter Bull was a Norwegian theatre worker. He was appointed at the National Theatre of Norway from 1909 to 1950 in various administrative positions, including secretary and stage director. He was the brother of literary historian Francis Bull, and politician Edvard Bull...

, historian and politician Edvard Bull

Edvard Bull, Sr.

Edvard Bull was a Norwegian historian and politician for the Labour Party. He took the doctorate in 1912 and became a professor at the University of Kristiania in 1917, and is known for writings on a broad range of subjects. In addition to his academic work, he is known for his work on Norsk...

 and literary professor Francis Bull

Francis Bull

Francis Bull was a Norwegian literary historian, professor at the University of Oslo for more than thirty years, essayist and speaker, and magazine editor.-Early and personal life:...

. Through Edvard Bull he was the uncle of historian Edvard Bull

Edvard Bull, Jr.

Edvard Bull , Edvard Bull d.y. or Edvard Bull, Jr., was a Norwegian historian.He was born in Kristiania as the son of professor and politician Edvard Bull, Sr.. He was active member of the Workers' Youth League...

. He was also a nephew of military officer Karl Sigwald Johannes Bull, grandnephew of Anders Sandøe Ørsted Bull, great-grandson of Georg Jacob Bull

Georg Jacob Bull

Georg Jacob Bull was a Norwegian jurist and politician.He was a stipendiary magistrate of Bergen from 1810 to 1821. While stationed here, he was elected to the Norwegian Parliament for the year 1821...

 and great-great-grandson of Chief Justice Johan Randulf Bull

Johan Randulf Bull

Johan Randulf Bull was a Norwegian judge.He was born in Stod, as the brother of Johan Lausen Bull. He took the jurist examination in Copenhagen in 1778, and was a member of Det Norske Selskab there...

.

In his professional career he worked as a wholesaler. He also published several genealogical works, and was the chairman of the Norwegian Genealogical Society

Norwegian Genealogical Society

Norwegian Genealogical Society is a genealogical society in Oslo, Norway.It was founded on 22 October 1926 as the first exclusively Norwegian genealogical society. Among the founders were Stian Herlofsen Finne-Grønn, Christoffer Morgenstierne Munthe and Sigurd Segelcke Meidell...

from 1943 to 1952. In 1952 he was created an honorary member.