Balian III of Beirut (died 1247) was the Lord of Beirut, the second of his family, from 1236, and a son of the famous "Old Lord" John of Ibelin, by his second wife Melisende of Arsuf. From his father he assumed the leadership of the nobility in the War of the Lombards, fought against the agents of the Emperor Frederick II. Balian led his family in besieging Tyre in 1242. He also had the support of Philip of Novara and Philip of Montfort and he employed mercenaries and galleys in the endeavour.