Doonagore Castle is a round 16th-century tower house with a small walled enclosure located about 1 km south of the coastal village of Doolin in County Clare, Ireland.

[1]:99 A castle was built on (or near) the site of an even earlier ringfort by Tadhg (Teigue) MacTurlough MacCon O'Connor some time during the 14th century.

Unlike most tower houses in the region, this was built not from limestone but from sandstone drawn from the quarry of Trá Leachain (Flaggy Beach) about 2 km to the southwest.

One-hundred-seventy survivors were caught by the High Sheriff of Clare, Boetius Clancy and hanged at Doonagore Castle[2] or on a nearby Iron Age barrow near Doolin called Cnocán an Crochaire (Hangman's Hill).

[1]: 101 It was restored in the 1970s by architect Percy Le Clerc for a private purchaser, an Irish-American named John C. Gorman[2] whose family still owns it.