Mauricius Ó Leaáin was Bishop of Kilmacduagh, Ireland, from 1254 to 1284.
Ó Leaáin (O'Leane, Lane, Linnane) is associated with the Oranmore–Clarenbridge area of County Galway.
He was the first of three men of the surname to become bishop of Kilmacduagh.
Ó Leaáin was elected before 15 May 1254 and received possession of the temporalities after that date.
This article about a bishop of the Middle Ages is a stub.