Mill Reef, also known as Half Moon Bay, is a village in Saint Philip, Antigua and Barbuda. It had a population of 13 people in 2011.
According to the Antigua and Barbuda Statistics Division, the village had a total area of 10.34 square kilometres in 2011.
There were 13 people living in Mill Reef as of the 2011 census. 100% of the village was of African descent. The population was born in different countries, with 90.9% in Antigua and Barbuda and 9.09% in Jamaica. The population had diverse religious affiliations, including 45.45% Methodist, 27.27% Anglican, and 27.27% not stated.