The Diocese of Paisley is an ecclesiastical territory or diocese of the Latin Church of the Catholic Church in Scotland. Erected on 25 May 1947 from the Archdiocese of Glasgow, the diocese covers the historic county of Renfrewshire and is 580 km2 (220 sq mi) in area making it the smallest diocese by area in Scotland.

Saint Mirin was born in 565, is also known as Mirren of Benchor, Merinus, Merryn and Meadhrán. The patron saint of the town and Roman Catholic diocese of Paisley, Scotland, he was the founder of a religious community which grew to become Paisley Abbey. The shrine of this saint in the abbey became a centre of pilgrimage.