Thomas of Capua (Italian: Tommaso da Capua, Latin: Thomas Capuanus), also called Tommaso di Eboli (before 1185 – August 1239), was an Italian prelate and diplomat. He served as the archbishop-elect of Naples from 1215 until 1216 and then as a cardinal until his death. He administered the diocese of Albano between 1218 and 1222 and was the papal legate in the kingdom of Italy from November 1236 until October 1237. He was the most important of Pope Gregory IX's negotiators with the Emperor Frederick II between 1227 and 1237.
Thomas was a notary and a longtime official of the apostolic chancery and apostolic penitentiary. He wrote poetry and style guides in Latin, and 700 of his letters have been preserved. He was an early supporter of the mendicant orders.