FitzRobert is an English surname of Irish origin. Notable people with this surname include:
John FitzRobert, Lord of Warkworth Castle.
Mabel FitzRobert, Anglo-Norman noblewoman.
William Fitz Robert, son of Sir Robert de Caen.
William Fitz-Robert, Earl of Cornwall
Robert FitzRobert, 1st Earl of Glouchester.
Maud FitzRobert, Anglo-Norman noblewoman.
Simon of Wells, also known as Simon FitzRobert, medieval Bishop.
William de Chesney, also known as William FitzRobert, Anglo-Norman nobleman and sheriff.