Aillwee Cave, Show cave in County Clare, Ireland

Aillwee Cave is a show cave in the Burren karst of County Clare, with over a kilometre of passages running east to west before turning south about 600 metres in. Its features include an underground river, a waterfall, and large stalactites and stalagmites. The show cave tour covers roughly 300 metres and ends at a point called the Highway.

Farmer Jack McGann found the cave entrance in 1944 after his dog chased a rabbit into it, but he kept the discovery to himself for nearly 30 years. He told cavers in 1973, and that summer they explored as far as a boulder choke. The choke was removed in 1977, opening the rest of the cave, and the Marine Blast tunnel was completed in 1992 for a circular trip.

The name Aillwee comes from the Irish Aill Bhuí, meaning "yellow cliff", after the limestone of the Burren around the entrance. The cave is privately owned and run together with a Birds of Prey Centre, where shows and "hawk walks" are held. The cave also appears in the Father Ted episode "The Mainland" as "The Very Dark Caves".

Tours cover roughly 300 metres of the cave, about a third of its total length, and end at a point called the Highway before a 250-metre man-made tunnel leads back out. The access building has won the Europa Nostra prize, and a café and gift shop stand on site. A Birds of Prey Centre with flying displays and hawk walks shares the grounds.

The two brown bear bones found in 1976 were dated to over 10,000 years ago, when only about 1,000 people are thought to have lived in Ireland. The cave is often described as Ireland's last bear den.