Margaret Grey (c. 1397 – after April 1426 and before October 1427) was a Cambro-Norman noblewoman, the daughter of Reginald Grey, 3rd Baron Grey de Ruthyn, a powerful Welsh Marcher Lord, who was the implacable enemy of Owain Glyndŵr. Margaret was the first wife of William Bonville, K.G., first Lord Bonville who was decapitated by Queen consort Margaret of Anjou following the Yorkist defeat at the Second Battle of St Albans.