Ballincollig Castle, Medieval castle ruins in Ballincollig, Ireland.

Ballincollig Castle is a ruined Norman castle south of Ballincollig, County Cork. Its 13th-century keep, 14–15 m high, stands within a bawn whose walls are about 1.5 m thick and 5 m high, with two defensive towers and traces of a hall fireplace and a two-light window.

The fortress was originally built by Norman settlers and later came under the control of the Barrett family from around 1458. The Barretts held it until the early 1600s when Sir Walter Coppinger took possession.

The castle shows Norman building styles that came to Ireland, with its defensive towers and enclosed courtyard. These structures reveal how medieval warriors fortified their positions.

The castle ruins can be visited year-round with access to the exterior areas featuring walls, towers, and the central keep. Wear comfortable footwear suited to uneven terrain and watch for rocky ground surrounding the structure.

The northern section of the ruins is older than the southern part, which was added during the 16th century to fully utilize the natural rock formation. These different construction phases are visible in how the walls and structures are arranged.