Ballylumford Dolmen is a dolmen in County Antrim, Northern Ireland. It is near the north-west tip of the Islandmagee peninsula by Ballylumford power station. Known locally as the "Druid's Altar", it could be 4000 years old, or the remains of an even earlier passage grave. The dolmen consists of four upright stones, with a heavy capstone and a fallenstone within the structure. This may have been put there to block the entrance to the tomb. The dolmen is in the front garden of a house. A wall plaque at the site describes the dolmen as a single chambered grave erected about 2000-1600 BC. Local finds indicate occupation of the neighbourhood during the Bronze Age.