Er nad yw'n aelod o'r UE a'i bod y tu allan i Undeb Tollau'r UE, mae gan Norwy fynediad llawn a dirwystr at y Farchnad Sengl ar gyfer y rhan fwyaf o'i nwyddau a'i gwasanaethau drwy fod yn aelod o'r Gymdeithas Masnach Rydd Ewropeaidd (EFTA) a'r Ardal Economaidd Ewropeaidd (EEA).
Although not an EU member and outside of the EU Customs Union, Norway has full and unfettered access to the Single Market for most goods and services through its membership of the European Free Trade Association (EFTA) and the European Economic Area (EEA).