The Barony of Loch Soilleir is an SCA branch in the Kingdom of Ansteorra. Originally a part of the Barony of Stargate, the Barony of Loch Soilleir encompasses the southern part of greater Houston including Brazoria and Galveston Counties, as well as the Clear Lake area.

The name of the Shire of Loch Soilleir was registered in August of 1980 and the device was registered in February of 1987. Loch Soilleir was elevated to Baronial status on June 15, 1991.