Breakfast (literally meaning "breaking the fast" of the night) is the first meal taken after rising from a night's sleep, most often eaten in the early morning before undertaking the day's work. Among English speakers, "breakfast" can be used to refer to this meal, or, less commonly, to refer to a meal composed of traditional breakfast foods (eggs, oatmeal, sausages, etc.) served at any time of day.

Breakfast foods vary widely from place to place, but often include a carbohydrate such as grains or cereals, fruit and/or vegetable, a protein food such as eggs, meat or fish, and a beverage such as tea, coffee or fruit juice. Coffee, tea, juice, breakfast cereals, pancakes, sausages, bacon, sweet breads, fresh fruit, vegetables, eggs, mushrooms, black pudding, baked beans, muffins, crumpets and toast with butter or margarine and/or jam or marmalade are common examples of breakfast foods, though a large range of preparations and ingredients are associated with breakfast globally.

Nutritional experts have referred to breakfast as the most important meal of the day, citing studies that find that people who skip breakfast are disproportionately likely to have problems with concentration, metabolism, and weight.