Grenagh (Irish: Greanach)[2] is a village close to Mallow in County Cork, Ireland.

It is situated approximately 1 km from the main Cork-Limerick N20 road.

The village is served by St. Lachteen's Catholic Church.

[3] The local Gaelic Athletic Association, Grenagh GAA, have twice won the Cork Intermediate A Football Championship.

[2] Grenagh is part of the Cork North-Central (Dáil constituency).