Dough Castle (Irish: Dumhach Ui Chonchuir – "sandbank of the O'Connors") is a ruined tower house at Lahinch in County Clare, western Ireland.

It served as their principal stronghold and was sited at the strategically important mouth of the Inagh River, where it could control both land and water traffic.

[citation needed] In return for his actions, Dough castle was spared from being demolished or slighted by the Cromwellian army.

No trace has been found of a supposed underground passage, filled with valuables, leading from the castle to Liscannor.

[1][2]: 62 Due to poor foundations on sand,[1] the castle collapsed several times and today it is in ruins, with little more than part of the O'Brien tower remaining[3] on Lahinch Golf Course near where the Dealagh joins the Inagh River.