Carrickmacross or Carrickmacros (Irish: Carraig Mhachaire Rois, meaning "rock of the wooded plain") is a town in County Monaghan, Ireland. The town and environs had a population of 4,925 according to the 2011 census, making it the second largest town in the county. The town won the prestigious European Entente Florale Silver Medal Award. It is a market town which developed around a Castle built by the Earl of Essex in 1630. The Convent of the St. Louis Nuns now stands on the original castle site. The local Gaelic football and Hurling club is Carrickmacross Emmets.