Heir Island (also known as Hare Island or Inis Uí Drisceoil) is a small inhabited island in southwest County Cork, roughly 2. 5 km long and 1. 5 km wide, and the fourth-largest of Carbery's Hundred Isles.

It supports a year-round population of around 25–30 people and is accessible only by boat from Cunnamore Pier on the mainland. The primary access point is Cunnamore Pier, from which the M. V.

Thresher ferry makes the approximately four-minute crossing on a year-round scheduled service. Additional ferry operators also serve the island. No booking is required for the standard crossings.

The island offers sandy beaches, coastal walks, and opportunities for sea kayaking among its caves and creeks, and has become a draw for artists and visitors seeking a quiet retreat on Ireland's Wild Atlantic Way.