Rinn an Chaisleáin or Castle Point is a National Monument on Great Blasket Island, Ireland.

Rinn an Chaisleáin is located directly north of Great Blasket's "Lower Village", to the west of the harbour.

[4] Rinn an Chaisleáin was originally the site of a castle built by the Ferriters.

[citation needed] In 1840 a Protestant "soup-school" was built using the stones from the castle ruins; it closed in 1852.

In times of bad weather the island would be cut off from the mainland, and corpses remained unburied, sometimes for weeks.