William Montacute or William de Montacute may refer to:
William de Montacute, 2nd Baron Montacute (c. 1285–1319) William Montacute, 1st Earl of Salisbury (1301–1344) William Montacute, 2nd Earl of Salisbury (1328–1397)
See also William Montagu (disambiguation)
fr:William Montagu