William de Beaumont, 3rd Earl of Warwick

William de Beaumont, 3rd Earl of Warwick (before 1140 – 15 November 1184) was an English nobleman. He was married to Matilda de Percy (†c. 1204), daughter of William de Percy (†1175) and his first wife Alice of Tonbridge (†1148).

He inherited the earldom from Roger de Beaumont, 2nd Earl of Warwick. On his father's death in 1153, William may have been a minor. William died, probably on Crusade, in 1184, and was succeeded by his brother Waleran de Beaumont, 4th Earl of Warwick.