Dunkerron Castle (Irish: Caisleán Dún Ciarán)[1] is a ruined four-storey tower house located in Templenoe, near Kenmare, County Kerry, in south-west Ireland.

The four-storey tower house was built in the 13th century on a limestone outcrop as a Norman (Carew) stronghold.

[4][5][2][6] An inscribed plaque, dated 1596, recorded the castle's association with the O'Sullivan Mór and MacCarthy Reagh dynasties.

[8][9] The main O'Sullivan Mór familial seat moved to nearby Cappanacush Castle during the 17th century,[10] and antiquary Samuel Lewis noted that both castles were "traditionally said to have been defended" by their O'Sullivan Mór owners during the mid-17th century Cromwellian conquest of Ireland.

[11] The O'Sullivan castles and lands at Dunkerron and Cappanacush were confiscated following this conflict under the Act for the Settlement of Ireland 1652, and assigned to Cromwellian supporter William Petty.