The Mullet Peninsula —also known as the Mullet (an Mhuirthead) and sometimes as the Erris Peninsula—is a peninsula in the barony of Erris in County Mayo, Ireland. It consists of a large promontory connected to the mainland at Belmullet (Béal an Mhuirthead), a town of about 2,000 inhabitants, by a narrow isthmus. There are several villages on the Mullet peninsula including Aughleam, Elly, Corclough and Binghamstown. It is about 33 km long and 12 km wide at its widest parts, and about 50 metres at the narrowest part. Its northernmost point is Erris Head. The peninsula's doglegged shape forms two bays, Blacksod Bay and Broadhaven Bay.