The Norwegian Society of Engineers and Technologists (Norwegian: Norges Ingeniør- og Teknologorganisasjon; NITO) is the largest union in engineering in Norway with approximately 90 000 members.^[3] NITO has 21 regional branches covering the country and over 2,000 local clubs and shop stewards. Most of the working members are affiliated to a local club. The local clubs or workshops are organisationally placed directly under the regional branches. With a few exceptions the branches follow Norway's county borders.

NITO was established in 1936 and is an independent, non-affiliated, and non-political union.

NITO is led by a Board of Representatives. The daily work of the union is carried out by shop stewards and elected union representatives at different organisational levels; by the secretariat and main office in Oslo, consisting of the general secretary and 75 employees; and by the 23 employees who run the branch offices.

Presidents

• Frithjof Svendsen (1936–1937)
• Einar I. Larsen (1937–1941)
• Arne G. Myhrvold (1941–1948)
• Brynil Brynjulfsen (1948–1952)
• Erling Willoch (1952–1954)
• Arne H. Johansen (1954–1968)
• Trygve Hanæs (1968–1975)
• Lars Harlem (1975–1979)
• Harald Skuggedal (1979–1983)
• Gunnar Hamre (1983–1987)
• Jan Abrahamsen (1987–1990)
• Svein Erik Andresen (1990–1995)
• Svein Vikhals (1995–1998)
• Roger Johansen (1998–2000)
• John A. Haugen (2000–2003)
• Marit Stykket (2003–2012)
• Trond Markussen (fra 2012)

Secretaries General

• Modolf Guttelvik (1945–1946)
• Oddvar de Lange (1946–1950)
• Knut Reistad (konstituert) (1950–1951)
• Trygve Sommerhein (1951–1968)
• Erik Bjore (1968–1981)
• Anth. B. Nilsen (1981–1992)
• Erik Prytz (1992–2011)
• Steinar Sørlie (fra 2011)