Alexander of Menteith (d. bef. 1306), a Scottish nobleman and member of the Stewart family, he was the Earl of Menteith.
Alexander was the eldest son and heir of Walter Bailloch Stewart and Mary I, Countess of Menteith and was the Mormaer or Earl of Menteith succeeding his mother the de jure countess. The first mention of him in records is with his brother John de Menteith in a compact dated on 20 September 1286, at Turnberry, Carrick, between Bruce and the Stewarts. In another writ, of uncertain date, granted by their father to Kilwinning Abbey, he and his brother are styled Alexander and John de Menteith. Alexander joined with his father in a charter granting the church of Kippen to the Cambuskenneth Abbey situated within the earldom as a place of burial; the writ being dated 1286. He was appointed the Sheriff of Dumbarton in 1288. Prior to succeeding his father, Alexander was at Norham in 1291, and was among those who swore fealty to Edward I. Alexander was with his brother John at the Battle of Dunbar on 27 April 1296, and fled to Dunbar Castle where he and others were taken prisoner and he was committed to the Tower of London. His detention was not long, however, and he was liberated after promising to serve the English King, meeting with him at Elgin 27 July 1296. He repeated this promise, and swore fealty at Berwick a month later, on 28 August, as Alexander Comes Meneteth. Alexander then gave over two of his sons, Alan and Peter, as hostages. Alexander seems to have retired from public life after this, tending only to his family affairs. He died before 1306.