Old Town is a city in Penobscot County, Maine, United States. The population was 7,431 at the 2020 census. The city's developed area is chiefly located on the relatively large Marsh Island, but its boundaries extend beyond it. The island is surrounded and defined by the Penobscot River to the east and the Stillwater River to the west.

The Penobscot are an Indigenous people in North America from the Northeastern Woodlands region. They are organized as a federally recognized tribe in Maine and as a First Nations band government in the Atlantic provinces and Quebec.