Hatfield is a borough in Montgomery County, Pennsylvania, United States. The population was 3,290 at the time of the 2010 census. It is part of the North Penn Valley region that is centered around the borough of Lansdale. The borough is surrounded by Hatfield Township.

Montgomery County, colloquially referred to as Montco, is a county in the Commonwealth of Pennsylvania. As of the 2020 census, the population of the county was 856,553, making it the third-most populous county in Pennsylvania after Philadelphia and Allegheny counties. The county is part of the Southeast Pennsylvania region of the state.