People educated at Oslo Cathedral School

Ellen Auensen (born 28 June 1944) is a Norwegian illustrator.
She was born in Oslo. She finished her secondary education at Oslo Cathedral School in 1963, and graduated from the Norwegian National Academy of Craft and Art Industry in 1968. In the same year she was hired as an illustrator and political cartoonist in the newspaper Morgenbladet. She was awarded the Narvesen Prize in 1973. She was the only female illustrator to win this award; two men Gösta Hammarlund and Henry Imsland won it in the 1950s. Some of her political cartoons were released as books with writings by Knut Bøckman: Ellen 72: Se Norges blomsterdal (1972), Ellen 73: Mot den evige sne (1973) and Ellen 75: I hine hårde dage (1975).From 1978 to 1990 she lived in Sweden and worked for Sveriges Radio and Swedish publishing houses. After returning to Norway she mainly illustrated book covers after 1990.

Ingrid Schulerud (born 8 July 1959) is a Norwegian diplomat.She served as Norway's ambassador to Belgium from 2015 to 2019.

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

Trond Hegna (2 October 1898 – 20 January 1992) was a Norwegian author, journalist and editor. He served as a member of the Norwegian Parliament
from Rogaland from 1949 to 1965.

Egil Sundt (23 September 1903 – 6 September 1950) was a Norwegian lawyer and government official who served as director of several national agencies.
Egil Kaare Sundt was born in Kristiania (Now Oslo), Norway. He was the son of Othar Sundt and Sigrid Holm. In 1929 he married Dagny Dick Thorkildsen. He graduated from the Oslo Cathedral School from 1922. He earned his law degree in 1925.
In 1929, Sundt began working with the National Ministry of Finance. In 1933, he became Chief Financial Office of the bureau. Sundt served as Director-General of the Norwegian Broadcasting Corporation from 1939 to 1940. During the Nazi occupation of Norway, Sundt was director of the financial services and insurance company Norske Alliance (now Storebrand). From 1945 to 1946, he was Councillor of State in the Norwegian Ministry of Finance. He served as Director-General of the Norwegian State Railways from 1946 until his death in 1950.

Carsten Smith (born 13 July 1932, in Oslo) is a Norwegian judge and lawyer.
He served as Dean of the Faculty of Law, University of Oslo (1977–1979) and as Chief Justice of the Supreme Court of Norway (1991–2002). After his retirement from the court, he continued to handle international arbitration cases, and worked with the United Nations.He was appointed Reader in Law at the University of Oslo in 1960 and Professor of Law with a specialization in commercial and banking law in 1964. He also was the first chairman of the Sami Rights Commission.Among his many published works is Kausjonsrett. Carsten Smith was awarded the Grand Cross of the Royal Norwegian Order of St. Olav on 13 May 2003. In 1985, he received the Fritt Ord Honorary Award. He is a member of the Norwegian Academy of Science and Letters. He also received honorary degrees from several institutions, including Uppsala University and Brigham Young University.