A doughnut or donut is a type of leavened fried dough. It is popular in many countries and is prepared in various forms as a sweet snack that can be homemade or purchased in bakeries, supermarkets, food stalls, and franchised specialty vendors.

Doughnuts are usually deep fried from a flour dough, and typically either ring-shaped or a number of shapes without a hole, and often filled, but can also be ball-shaped. Other types of batters can also be used, and various toppings and flavorings are used for different types, such as sugar, chocolate, or maple glazing.