Rathlin Island Harbour sits in the north-east corner of Church Bay on Rathlin Island, Northern Ireland's only inhabited offshore island, located roughly six miles from Ballycastle on the mainland.

The harbour is the island's principal access point, serving both the regular passenger ferry from Ballycastle and visiting recreational vessels.

The harbour is protected by two substantial boulder-based breakwaters and features three secure pontoons capable of holding up to 40 vessels, with rafting recommended during busy summer periods.

Public toilets, showers, and waste facilities are available nearby. A short walk from the harbour leads to the Boathouse Visitor Centre, and bus services connect the harbour to the RSPB Seabird Centre and West Lighthouse at the island's far end.