Thomas of Brotherton, 1st Earl of Norfolk (1 June 1300 – 4 August 1338), was the fifth son of King Edward I of England (1272–1307), and the eldest child by his second wife, Margaret of France, the daughter of King Philip III of France.
He was, therefore, a younger half-brother of King Edward II (1307–1327) and a full brother of Edmund of Woodstock, 1st Earl of Kent.
He occupied the office of Earl Marshal of England.