A spiced bun is a sweet bun to which spices were added during the baking process. Common examples are the hot cross bun and the Jamaican spiced bun.
Many local forms of the spiced bun exist, an example of which is the Cornish saffron bun.
The hot cross bun is probably the most well-known manifestation of the spiced bun, and a great tradition has grown up around it in England. Hot cross buns are traditionally baked on Good Friday, although they can often be purchased at other times of year. In Australia and New Zealand, the Boston bun is a larger variety of the spiced bun, topped with coconut icing.