Adamstown may refer to one of the following places:
- Australia
- Adamstown, New South Wales, a town in New South Wales
- Ireland
- Adamstown, County Wexford, a village in County Wexford
- Adamstown, Dublin, an urban village in County Dublin
- Pitcairn Island (UK possession, Oceania)
- Adamstown, Pitcairn Islands, the capital city of the Pitcairn Islands
- United States
- Adamstown, alternate name for Neals Diggins, California
- Adamstown Township, Maine
- Adamstown, Maryland, a town in Frederick County, Maryland
- Adamstown, Pennsylvania, a borough in Lancaster County, Pennsylvania