Derrynane Abbey (Ahamore Abbey/Irish: Mainistir Achaidh Mhóir) is a ruined abbey in County Kerry, Republic of Ireland. It is located near the town of Caherdaniel and is very close to Derrynane House, the house of Daniel O'Connell. Derrynane Abbey is on an island appropriately named Abbey Island. It is accessible from the mainland through a beach.