A cafeteria is a type of food service location in which there is little or no waiting staff table service, whether a restaurant or within an institution such as a large office building or school; a school dining location is also referred to as a dining hall or canteen (in UK English). Cafeterias are different from coffeehouses, although that is the Spanish meaning of the English word.

Instead of table service, there are food-serving counters/stalls, either in a line or allowing arbitrary walking paths. Customers take the food they require as they walk along, placing it on a tray. In addition, there are often stations where customers order food and wait while it is prepared, particularly for items such as hamburgers or tacos which must be served hot and can be quickly prepared. Alternatively, the patron is given a number and the item is brought to their table. Sometimes, for some food items and drinks, customers collect an empty container, pay at the check-out, and fill the container after the check-out. Free second servings are often allowed under this system. For legal purposes (and the consumption patterns of customers), this system is rarely or never used for alcoholic beverages in the USA.

Customers are either charged a flat rate for admission (as in a buffet), or pay at the check-out for each item. Some self-service cafeterias charge by the weight of items on a patron's plate.

As cafeterias require few employees, they are often found within a larger institution, catering to the clientele of that institution. For example, schools, colleges and their residence halls, department stores, hospitals, museums, military bases, prisons, and office buildings often have cafeterias.