Castle Hackett is a 13th-century tower house at the base of Knockma hill, 10 kilometres (6 mi) south-west of Tuam, in the parish of Caherlistrane, County Galway, Ireland.

The Castlehacket branch of the family was established in the mid-17th century by Sir John Kirwan.

The castle was abandoned in the 18th century and the Kirwans built a new three-storey house nearby.

[1] In the introduction to his Fairy and Folk Tales of the Irish Peasantry (1888), William Butler Yeats mentions the family and Castlehacket, writing, "Each county has usually some family, or personage, supposed to have been favoured or plagued [with fairy-seeing abilities], especially by the phantoms, as the Hackets of Castle Hacket, Galway, who had for their ancestor a fairy…"[2] This article about a castle in Ireland is a stub.

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