A bun is a small, usually sweet bread. They are hand-sized or smaller, dome shaped, with a flat bottom. A bun can also be a savory.

Basic buns are usually made using these basic ingredients: flour, sugar, milk, yeast, butter and cardamom. They may contains currants and sultanas. They may be topped with icing or filled with jam or some other thing.

A “Bun” may also refer to a kind of filled dumpling. A bun can be long and skinny, short and round, and come in many different shapes and sizes.

In North England and Ireland small cakes are called as buns. Sponge buns, currant buns and butterfly buns are well known examples.