Pat O'Loughlin (29 October 1873 – 14 August 1956) was an Australian rules football player at the Essendon Football Club in the Victorian Football League (VFL). In the first year of competition, 1897, he became one of the club's and league's first premiership players. O'Loughlin made his VFL debut against Geelong in round 1 of the season at Corio Oval.
The surname O'Loughlin is an Anglicised form of the Irish Ó Lochlainn meaning "descendant of Lochlann".
Ó Lachtnáin was the name of as many as eight Gaelic-Irish families, located in Connacht and Munster.
The Gaelic personal name Lachtnán is derived from lachtna ("gray").
It is now found as Loughnan, Loughnane, Laughnan, Loftus.