What protected designation is used for beer sold at Munich's Oktoberfest?

The protected designation used for beer sold at Munich’s Oktoberfest is Oktoberfestbier.

The name identifies beer brewed within Munich and according to Germany’s traditional brewing rules. The designation is protected as a geographical indication, so it is not simply a generic label that any brewery anywhere can use for a beer marketed as “Oktoberfest.” Munich’s six traditional Oktoberfest breweries hold the right to produce the official festival beer.

A common mix-up is treating Oktoberfestbier, Märzenbier, and Festbier as exact synonyms. Märzen was the traditional, darker and fuller-bodied style associated with the festival, while modern Munich Oktoberfest beer is generally a paler Festbier. “Wiesnbier” is another informal German term, using Wiesn, the Bavarian name for the festival grounds, but Oktoberfestbier is the protected designation asked for here.

The beer is served in the festival’s large tents, alongside amusement rides, food stalls, and Bavarian entertainment. The official beer tradition connects the modern celebration to Munich’s brewing history rather than to every beer labeled “Oktoberfest” internationally.