Firhouse (Irish: Teach Giúise) is an outer suburb of Dublin, in the jurisdiction of South Dublin, Ireland, developed from what was historically a small rural village by the River Dodder, with a second settlement, Upper Fir-house, nearby.[1] It is just inside the M50 orbital motorway, and in the postal district of Dublin 24, and is adjacent to Knocklyon (with which it shares a townland) and Templeogue, and also close to Tallaght. In the historic divisions of local administration, Firhouse is in the civil parish of Tallaght and the barony of Uppercross.

Firhouse is located between Templeogue, Knocklyon, Ballycullen, and Tallaght, close to the foothills of the Dublin Mountains, in an area that was predominantly rural a few decades ago. It is situated on the eastern bank of the River Dodder, just upriver from Templeogue and 2 km downstream from Tallaght village. Modern development only began in recent decades, although there were previously a number of mills and the two hamlets.