Alypius of Thagaste was a 4th-century bishop and priest from the Roman province of Africa Proconsularis. Born around 360, he was a lifelong companion of Augustine of Hippo, eventually joining him in his conversion to Christianity. After serving as a magistrate in Rome, he moved to Milan to hear the preaching of Ambrose. He later returned to North Africa, where he helped found a monastic community and eventually ascended to the episcopacy in Thagaste.