William Fitz Robert, 2nd Earl of Gloucester (died 1183) was the son and heir of Sir Robert de Caen, 1st Earl of Gloucester, and Mabel FitzRobert of Gloucester, daughter of Robert Fitzhamon.
* Robert B. Patterson, « William, second earl of Gloucester (d. 1183) », Oxford Dictionary of National Biography, Oxford University Press, septembre 2004; online edn, janvier 2008.