The Treaty of Leake was an agreement between the "Middle Party", including courtier adherents of Edward II of England, and the king's cousin, the Earl Thomas of Lancaster and his followers. It was signed at Leake in Nottinghamshire on 9 August 1318. The treaty was meant to reconcile the King and his favourites with Lancaster and other baronial opponents. Central to the negotiations were Aymer de Valence, Earl of Pembroke, Humphrey de Bohun, Earl of Hereford and various prelates.