20th-century Norwegian engineers

Rolf Østbye (17 April 1898 – 20 November 1979) was a Norwegian businessperson.
He was born in Kristiania as a son of rector Niels Johan Hagerup Østbye (1866–1952) and Johanne Elisabeth Mellbye (1873–1962). From 1923 to 1931 he was married to Reidun Berg (1899–1976), and from 1933 he was married to Ellen Martinsen (1904–1997), a granddaughter of Gustav Martinsen.He worked in Ringnes Bryggeri, Lillehammer Bryggeri and Bjølsen Valsemølle at a young age, but took education as a chemical engineer. He was hired in Standard Telefon og Kabelfabrik in 1947, and became chief executive officer in 1949. In 1953 he was hired in Norsk Hydro, becoming Director-General (CEO) in 1956. He stayed in this position until 1966; after this he was chairman of the board from 1967 to 1970. From 1966 to 1973 he chaired the Norwegian Trade Council, which is now a part of Innovation Norway.
He was also a supervisory council member of Forsikringsaktieselskabet Norden.

Erik Andreas Rotheim (19 September 1898 – 18 September 1938) was a Norwegian professional chemical engineer and inventor. He is best known for invention of the first aerosol spray can and valve that could hold and dispense fluids.

Tor Tank-Nielsen (9 July 1918 – 8 March 2010) was a Norwegian businessperson.He was born in Kristiania. He studied chemical engineering and graduated in 1940. In 1941 he was hired in the company M. Peterson & Søn, and after a series of promotions he became CEO in 1981.He is one of two honorary members in the Industrial Association of the city of Moss, the other one being Erik Mollatt.