Kilcumreragh (Irish: Cill Chruimthir Fhiachrach) is a civil parish which spans the counties of Westmeath and Offaly in Ireland. It is located about 23 kilometres (14 mi) west–south–west of Mullingar and 18 kilometres (11 mi) north–north–west of Tullamore.

Kilcumreragh also spans three baronies. It is one of 8 civil parishes in the barony of Moycashel (M), 4 civil parishes in the barony of Clonlonan (C) and 4 civil parishes in the Offaly barony of Kilcoursey (K), all in the Province of Leinster. The civil parish covers 9,280.6 acres (37.557 km), 6,964.9 acres (28.186 km) in County Westmeath and 2,315.7 acres (9.371 km) in County Offaly.

Kilcumreragh civil parish comprises the village of Rosemount and 32 townlands: Ballagh (C), Ballinderry (C and M), Ballinlig (M), Ballintober (M), Ballybeg (C), Ballybrickoge (M), Ballybroder (C), Ballynagall (M), Ballynagrenia (M), Ballynahinch (K), Brackagh (K), Burrow or Glennanummer (K), Cartron Glebe (K), Coolatoor or Grouselodge (M), Coolatoor (M), Curragh (M), Curraghanana (K), Custorum (M), Derryhall (M), Curraghanana (K), Earlscartron (K), Faheeran (K), Fearboy (K), Feargarrow (K), Grange (M), Grouselodge or Coolatoor (M), Kilcatherina (C), Kilcumeragh (M), Kilmurragh (K), Laragh (M), Lisnagree (M) Newtown and Parkwood (K).

The neighbouring civil parishes are: Killare (barony of Rathconrath) to the north, Ardnurcher or Horseleap to the east, Kilmanaghan (Barony of Clonlonan), Kilcumreragh (County Offaly) and Kilmanaghan (County Offaly) to the south, Ballyloughloe (Clonlonan) to the west and Ballymore (Rathconrath) to the west and north.

• Kilcumreragh civil parish at the IreAtlas Townland Data Base
• Kilcumreragh civil parish, County Westmeath at townlands.ie
• Kilcumreragh civil parish, County Offaly at townlands.ie
• Kilcumreragh civil parish, County Westmeath at The Placenames Database of Ireland
• Kilcumreragh civil parish, County Offaly at The Placenames Database of Ireland