Dexter is a town in Penobscot County, Maine, United States. The population was 3,803 at the 2020 census. It is part of the Bangor metropolitan statistical area. Dexter Regional High School, which serves Dexter as well as other nearby small towns, is located in the town.

Penobscot County is a county in the U.S. state of Maine, named for the Penobscot people in Wabanakik. As of the 2020 census, the population was 152,199, making it the third-most-populous county in Maine. Its county seat is Bangor. The county was established on February 15, 1816, from part of Hancock County when the area was still part of Massachusetts. Penobscot County is home to the University of Maine.