Brynjulf Friis Bull (17 October 1906 – 18 June 1993) was a Norwegian lawyer, Supreme Court attorney, and Mayor of Oslo.

Bull attended the Fru Nielsens Latinskole and took his examen artium in 1925 at Oslo Cathedral School.

[1][2] Bull established his own legal practice in partnership with Aake Ording in Oslo during 1933.

His long-term period of office in the Oslo City Council earned him the nickname "Sitting Bull".

In 1961, he was awarded the Petter Dass Medal (Petter Dass -medaljen) for his active efforts in the reconstruction of the Northern Norwegian Student Foundation (Nordnorsk Student- og Elevhjem).