Crooke's Castle is an ornamental tower or folly in Aghavrin townland, 4.8 km (3.0 mi) north-west of Coachford village, County Cork, Republic of Ireland.

It was built in the early 19th century by Thomas Epinetus Crooke of nearby Aghavrin House, who served during the Napoleonic Wars, mainly on board HMS Shamrock,[1] a Royal Navy blockade ship.

In A Topographical Dictionary of Ireland (1837), Lewis describes the demesne of Ahavrin as small but well planted, and refers to 'an isolated rock at its southern extremity' upon which 'stands a picturesque castellated tower, surmounted by a light and graceful turret'.

[4] The OS name book describes it as a tower or turret, built by Captain Crooke on Carrigacnubber rock, generally known as 'Ahavrin Castle', and referred to by Herbert Gilman as the 'Admiral's Folly'.

The Archaeological Inventory of county Cork describes it as a ruined square three-storey tower (2m x 2m), having rectangular window opes with hood-mouldings, and an embattled parapet.