Derrynane Abbey also known as Ahamore Abbey (Irish: Mainistir Achaidh Mhóir) is a ruined abbey in Derrynane in County Kerry, Ireland. It is located near the town of Caherdaniel and is very close to Derrynane House, the house of Daniel O'Connell. The abbey is on an island appropriately named Abbey Island. It is accessible from the mainland through a beach. It is believed to have been built in the 6th century.