Athclare Castle (or archaically Aclare, Irish Caisleán Áth Cláir) is a Tudor tower house in the Dunleer area of County Louth in Ireland.

As a result, the castle features some relatively modern additions, including, circular cast-iron downpipes, a steel gate, square-headed door openings to north, smooth rendered surrounds, some uPVC windows, uPVC and timber and glazed doors, hipped and pitched slate roofs, random rubble stone walling, segmental-headed window openings, red brick surrounds, painted timber casements etc., as well as a collection of agricultural buildings attached to the old castle.

The castle was significantly altered again in the 1840s, with the latter additions resulting in a number of out-buildings being added to form a north-forming courtyard to the site.

In the large room opening from this second story, under the lower roof is a fine carved stone fire-place and mantle retaining some traces of the gold, red and blue painting that once decorated it and bearing at one side of the Townley crest - a hawk on a perch beaked and belled and on the right another crest in very low relief (or perhaps rubbed off) resembling the arm with sword of the Taaffes.

On the ground floor are the three vaulted rooms in the plaster ceilings of which are the impressions of the rushffor willow covered cores or arches on which they were possibly originally built.