A cracker is a baked food typically made from flour. Flavorings or seasonings, such as salt, herbs, seeds, and/or cheese, may be added to the dough or sprinkled on top before baking. Crackers are often branded as a nutritious and convenient way to consume a staple food or cereal grain.

Crackers are eaten on their own or can accompany other food items, such as cheese or meat slices; dips; or soft spreads such as jam, butter, or peanut butter. Bland or mild crackers are sometimes used as a palate cleanser in food product testing or flavor testing, between samples. A precedent for the modern cracker can be found in nautical ship biscuits, military hardtack, and sacramental bread.

Ancestors of the cracker can be found in ancient flatbreads, such as lavash, pita, matzo, flatbrød, and crisp bread. Asian analogues include papadum and senbei.