Killeenadeema (Irish: Cillín a Díoma) is a civil parish in County Galway, Ireland.

Killeenadeema includes the southern part of Lough Rea and extends south to the border with County Clare.

[3] Adjoining parishes are Ardrahan, Ballynakill (Leitrim barony), Feakle (Clare), Kilchreest, Kilconickny, Killinan, Kilteskill, Kilthomas and Loughrea.

The church is set in a graveyard with many 18th- and 19th-century gravestones, surrounded by a rubble limestone boundary wall.

[7] According to Samuel Lewis in his Topographical Dictionary of Ireland (1837), KILLEENADEEMA, or KILNADEEMA, a parish, in the barony of LOUGHREA, county of GALWAY, and province of CONNAUGHT, 3 miles (S. by W.) from Loughrea ; containing 3554 inhabitants, This parish comprises a considerable portion of the Derrybrian mountains, and contains 1854 statute acres applotted under the tithe act.

In the R. C. divisions it is the head of a union or district, comprising also the parish of Kilteskill, and containing chapels at Kildeema, Derrybrian, and Ayle, About 2l0 children are educated in three public schools, to each of which the Earl of Clancarty contributes £5 annually, and about 120 are taught in two private schools.