Gorgonzola is a veined protected designation of origin (PDO) Italian blue cheese, made from unskimmed cow's milk. It can be buttery or firm, crumbly and quite salty, with a "bite" from its blue veining. Outside the EU and the countries recognizing the geographical origin protection, the name "Gorgonzola" can legally be used for similar cheeses, with only the full Italian name unambiguously referring to PDO Gorgonzola. It is a famously pungent cheese.

Blue cheese is any of a wide range of cheeses made with the addition of cultures of edible molds, which create blue-green spots or veins through the cheese. Blue cheeses vary in taste from very mild to strong, and from slightly sweet to salty or sharp; in colour from pale to dark; and in consistency from liquid to hard. They may have a distinctive smell, either from the mold or from various specially cultivated bacteria such as Brevibacterium linens.