​CARRICKMACROSS, a market town of Co. Monaghan, Ireland, in the south parliamentary division, 68 m. N.W. of Dublin on a branch of the Great Northern railway. Pop. of urban district (1901) 1874. It has a pleasant, elevated site, a considerable agricultural trade, and a famous manufacture of lace, which is carried on in various conventual establishments. There are some remains of an Elizabethan castle, a seat of the earls of Essex, which was destroyed during the wars of 1641; the ruins of the old church of St Finbar commemorate the same disastrous period.