The Soghain were a people of ancient Ireland. Dubhaltach Mac Fhirbhisigh identified them as part of a larger group called the Cruithin, and stated of them: Of the Cruithin of Ireland are the Dál Araidhi (Dál nAraidi), the seven Lóigisi of Leinster, the seven Soghain of Ireland, and every Conaille (see Conaille Muirtheimne) that is in Ireland.

The location of four of the seven Soghain is as follows:

The Soghain of Connacht were located in Tír Sogháin, and area in central east County Galway bounded by the river Suck on the east, the river Clare on the west; the Grange and Shiven rivers to the north; the Raford and Ballinure rivers to the south. A poem recorded in The Book of Uí Maine, Cruas Connacht clanna Sogain, lists the kingdom's boundaries, which can be found to tie in with the above locations:

The previous, pre-Gaelic people of the area were called the Senchineoil. Very little information survives on them.

The Soghain of Connacht were described by Seán Mór Ó Dubhagáin in his poem Triallam timcheall na Fodla where he states: