The Bishop of St. Andrews (Scottish Gaelic: Easbaig Chill Rìmhinn, Scots: Beeshop o Saunt Andras) was the ecclesiastical head of the Diocese of St Andrews in the Catholic Church and then, from 14 August 1472, as Archbishop of St Andrews (Scottish Gaelic: Àrd-easbaig Chill Rìmhinn), the Archdiocese of St Andrews.
The name St Andrews is not the town or church's original name. Originally it was Cellrígmonaid ("church of the king's mounth" hence Cill Rìmhinn) located at Cennrígmonaid ("head of the king's mounth"); hence the town became Kilrymont (i.e. Cellrígmonaid) in the non-Gaelic orthography of the High Middle Ages. Today St Andrews has replaced both Kilrymont (and variants) as well as the older English term Anderston as the name of the town and bishopric.
The bishopric itself appears to originate in the period 700–900. By the 11th century, it is clear that it was the most important bishopric in Scotland.