Mister Donut is an international chain of doughnut stores. It was founded in the United States in 1956 by Harry Winokur. Primary offerings include doughnuts, coffee, muffins and pastries. After being acquired by Allied Domecq in 1990, most of the North American stores became Dunkin' Donuts. Outside of the United States, Mister Donut maintains a presence in Japan, El Salvador, Philippines, Thailand, Indonesia, Taiwan, and Singapore.

A doughnut or donut is a type of pastry made from 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. Doughnut is the traditional spelling, while donut is the simplified version; the terms are used interchangeably.