He was born in Tromsø as a son of chief physician Fredrik Gottlieb Olsen Ramm (1855–1932) and Anna Margretha Brinchmann.
He served as a deputy judge in Hadeland and Land District Court from 1919 to 1920, and then studied in London for some time.
He started his own law firm in Kristiania in 1922, being a partner with barrister Johnny Ramm until 1926.
In that year, Harald Ramm himself became a barrister with access to working with Supreme Court cases, and was a partner of C. A. Gulbranson until 1930.
[3] Ramm chaired the Norwegian-Dutch Association, Amorett Konfektionsfabrik, Gausdal Høyfjellshotel, Holmenkollen Turisthotel, Grand Hotel in Tønsberg, Grønvold & Selmer, Norsk Soyamelfabrikk, Radio Industri and Industribygg Larvik.