Gilbert de Clare, 3rd Earl of Gloucester (c. 1180–1230), was a prominent English nobleman during the medieval period. He was the son of Richard de Clare, 2nd Earl of Gloucester and Maud de Lacy. Gilbert played a significant role in the political landscape of England, particularly during the reign of King John and the early years of King Henry III. As a powerful lord, Gilbert was involved in various conflicts, including the First Barons' War against King John. He was known for his military leadership and held extensive lands in England and Wales. His legacy continued through his descendants, who remained influential in English history.