Gilbert de Clare, 5th Earl of Gloucester (c. 1180–1230), was a prominent English nobleman during the medieval period. He was the son of Richard de Clare, 4th 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 subsequent First Barons' War. As a powerful lord, Gilbert held extensive lands in Gloucestershire and Herefordshire. He was known for his military involvement and alliances, which shaped the dynamics of feudal England. His legacy continued through his descendants, influencing the lineage of the de Clare family.