Mutton flaps, or breast of lamb, are an inexpensive cut of meat from a sheep.

Consisting of a sheep's lower rib meat, mutton flaps are considered a low-quality cut in Western countries, as opposed to pork and beef ribs.^[1] They have been described there as a "tough, scraggy meat", if not properly prepared.^[2] Their high fat content has also contributed to their unpopularity in many Western countries, although they are widely used as döner meat in Europe.^[3]

Mutton flaps are a staple in the South Pacific^[4] where their high fat content has been linked with the development of obesity problems.^[5][4] In 2000, Fiji banned their import.^[6][7] On July 1, 2020, Tonga banned the import of mutton flaps from New Zealand, claiming their consumption plays a major role in increasing obesity among the population.^[8]

In Indonesia, a similar cut of meat called breast of goat is cooked by cutting it into pieces and grilling using skewers. This dish, called sate kronyos, is especially popular in Bantul, Yogyakarta.^[9]