You have to be 18 years old to buy alcohol (wine, beer) but 20 to purchase hard liquor (anything with an alcohol content of 22%).

Most bars and clubs have an age restriction, usually 20-21 years of age.

Grocery stores sell beer and cider but are not permitted to sell anything above 4.7% alcohol content, and are only allowed to sell alcohol before 8 PM on weekdays and before 6 PM on Saturdays and not at all on Sundays and some holidays including Ascension Day (Kristi himmelfartsdag), the eves of Christmas (jul) and New Year (nyttårs), Easter (påske), and Whitsunday/Pentecost (pinse), and the public holidays (offentilige høytidsdager) 1st and 17th of May and on voting days at both the national and local levels (stemmedagen for stortingsvalg, fulkevalg og kommunevalg).

Liquor, wine, strong beers and ciders (i.e. anything stronger than 4.7%), is sold through the state-run Vinmonopolet (literally, the wine monopoly) shops. There are 272 Vinmonopolet shops in Norway. The monopoly shops generally close at 6 PM on weekdays and 3 PM on Saturdays. Check the opening times for individual stores.