Ringnes is the largest brewer in Norway.
Ringnes AS was founded in 1876. The company's brewery in the Grünerløkka district of Oslo produced its first beer in 1877. The brewery was founded by brothers Amund and Ellef Ringnes (Amund was the brewer, Ellef the administrator and salesman) together with financial director Axel Heiberg. Amund Ringnes (1840–1907) and Ellef Ringnes (1842–1929), were both born and grew up on the historic Ringnes farm in Krødsherad.
Ringnes produces beer, soft drinks and mineral water. Ringnes has six production plants: Nittedal (main plant Gjelleråsen), Trondheim (EC Dahl's Brewery), Arendal (Arendals Brewery), Bodø (Nordland brewery), Larvik (Farris mineral water) and Imsdalen in Østerdalen (Imsdalfabrikken).
The company sponsored the polar expeditions of Fridtjof Nansen and Otto Sverdrup and funded the construction of the exploration vessel Fram. During his exploration of the high Canadian Arctic in 1900, Sverdrup named three large islands after his sponsors (Axel Heiberg Island, Amund Ringnes Island, and Ellef Ringnes Island). The Geiberg Islands (Гейберга Острова) in the Russian Arctic were named after Axel Heiberg, and Ostrov Ringnes (Остров Рингнес), the largest island of the Mona group in the Kara Sea, was named after the brewery.