The Foss Brewery (Norwegian: Foss Bryggeri) was a brewery in Oslo. The company was started in 1836 as the Ytteborg Brewery (Ytteborgs Bryggeri)[1] and was located on Hausmanns gate (Hausmann Street).[2] In the 19th century, the water in the lower part of the Aker River became too contaminated to brew beer, and the brewery needed more space.[2] Therefore in 1897[2][3][4] the brewery relocated to new premises further upriver, above the town's Grünerløkka district at Upper Falls (Øvre Foss)[4][5]—one of two waterfalls forming Vøyen Falls (Vøyenfallene, Vøyenfoss). The company also changed its name to Foss Bryggeri (literally, 'Falls Brewery') to reflect the new location.