Lavash (also known as lahvosh or Armenian cracker bread) is a soft, thin flatbread made with flour, water, yeast, and salt. Toasted sesame seeds and/or poppy seeds are sometimes sprinkled on it before baking. While some wrap breads sold in the US label themselves as lavash, actual lavash is significantly thinner than those products, being approximately as thin as cotton fabric.

While soft, like a tortilla, when fresh, lavash is quick to dry, becoming brittle and hard. The soft form is usually preferrable, due to a better taste and ease of making wrap sandwiches, however the dry form can be used for long-term storage and is used instead of bread in Eucharist ceremonies by the Armenian Orthodox Church.

Because of its simple recipe and ease of cooking it has remained popular throughout the Eastern Mediterranean, Iran and the Caucasus since ancient times. Traditionally it is rolled out flat and slapped against the hot walls of a tandoor oven.