| Killeenadeema | |
| Native Name: | Cillín a Díoma |
| Native Name Lang: | ga |
| Pushpin Map: | Ireland |
| Pushpin Map Caption: | Location in Ireland |
| Pushpin Relief: | y |
| Coordinates: | 53.1097°N -8.5917°W |
| Subdivision Type: | Country |
| Subdivision Name: | Ireland |
| Subdivision Type1: | Province |
| Subdivision Name1: | Connacht |
| Subdivision Type2: | County |
| Subdivision Name2: | Galway |
| Subdivision Type3: | Baronry |
| Subdivision Name3: | Loughrea |
| Unit Pref: | Metric |
| Area Total Km2: | 98.9 |
Killeenadeema (Irish: Cillín a Díoma) is a civil parish in County Galway, Ireland. It contains most of the Derrybrien mountains, which hold the Derrybrien Wind Farm.
The name in Irish is Chillín a Díoma, where cillín means "little church".Thus, it means "Chapel of Díoma".
Killeenadeema is in the barony of Loughrea in County Galway, Ireland.The civil parish has an area of .The town of Loughrea lies on the north shore of Lough Rea, a lake.Killeenadeema includes the southern part of Lough Rea and extends south to the border with County Clare.It contains the Derrybrien Wind Farm.The R353 road crosses the southern part of the parish, running through Derrybrien.
Adjoining parishes are Ardrahan, Ballynakill (Leitrim barony), Feakle (Clare), Kilchreest, Kilconickny, Killinan, Kilteskill, Kilthomas and Loughrea.
The corresponding Catholic parish is in the Diocese of Clonfert.The Killeenadeema Graveyard about south of the lake contains the ruins of the ancient church of Saint Dimas as well as the more recent Catholic church.Saint Dympna's Church was built around 1830 with a single-bay nave and transepts.In 1920 a shallow canted single-bay apse was added.It is built of limestone, with pitched slate roofs.The interior has a timber battened ceiling, a carved timber gallery, marble altar furniture and signed stained glass windows by Harry Clarke.The church is set in a graveyard with many 18th- and 19th-century gravestones, surrounded by a rubble limestone boundary wall.
According to Samuel Lewis in his Topographical Dictionary of Ireland (1837),
Notable people associated with Killeenadeema include: