Tadhg Mac Cárthaigh was a 15th-century Irish ecclesiastic who served as the Bishop of Ross and later the Bishop of Cork and Cloyne. Born in West Cork around 1455 to a noble family, he studied in Paris and Rome before being appointed to his first see by Pope Sixtus IV. Despite his official appointments, political disputes and local rivals prevented him from exercising his authority in Ireland. He died in Ivrea, Italy, in 1492 while traveling as a pilgrim, having sought papal assistance to reclaim his dioceses.