Millbay is a small Hamlet on Islandmagee in County Antrim, Northern Ireland. Originally called Carnspindle Bay,nicknamed Millbay as there was a mill in the bay.Millbay is within the townland of Carnspindle. It is in the Larne Borough Council area. In the 2011 census it had a population of 103 people (40 households).
Ballylumford Dolmen, locally known as the "Druid's Altar", is an archeological site where artifacts from an ancient burial chamber have been recovered.