A kosher restaurant or kosher deli is an establishment that serves food that complies with Jewish dietary laws (kashrut). These businesses, which also include diners, cafés, pizzerias, fast food, and cafeterias, and are frequently in listings together with kosher bakeries, butchers, caterers, and other similar places, differ from kosher-style businesses in that they operate under rabbinical supervision, which requires the observance of the laws of kashrut, as well as certain other Jewish laws, including the separation of meat and dairy.

Kosher style refers to foods commonly associated with Jewish cuisine but which may or may not actually be kosher. It is a stylistic designation rather than one based on the laws of kashrut. In some U.S. states, the use of this term in advertising is illegal as a misleading term under consumer protection laws.