West Connacht was a kingdom of Gaelic Ireland, associated geographically with present-day County Galway, particularly the area known more commonly today as Connemara. The kingdom represented the core homeland of the Connachta's Uí Briúin Seóla kindred and although they ruled, there were smaller groups of other Gaels in the area, such as the Delbhna Tir Dha Locha and the Conmhaícne Mara. It existed from 1051 onwards, after the Ó Conchobhair, Kings of Connacht, pushed the Ó Flaithbheartaigh to the West of Lough Corrib, from their original territory of Maigh Seóla. Iar Connacht remained a subordinate túath of Connacht, until the 13th century, after which it was more independent.

Connemara is a region on the Atlantic coast of western County Galway, in the west of Ireland. The area has a strong association with traditional Irish culture and contains much of the Connacht Irish-speaking Gaeltacht, which is a key part of the identity of the region and is the largest Gaeltacht in the country. Historically, Connemara was part of the territory of Iar Connacht. Geographically, it has many mountains, peninsulas, coves, islands and small lakes. Connemara National Park is in the northwest. It is mostly rural and its largest settlement is Clifden.