Greenwood is a town in Oxford County, Maine, United States. The population was 774 at the 2020 census. The town was named for surveyor Alexander Greenwood. The village of Locke Mills, on State Route 26 in the northern part of Greenwood, is the town's urban center and largest settlement.

Oxford County is a county in the state of Maine, United States. As of the 2020 Census, the county had a population of 57,777. Its county seat is the town of Paris. The county was formed on March 4, 1805, by the Massachusetts General Court in the Maine District from northerly portions of York and Cumberland counties. It borders the Canadian province of Quebec. Part of Oxford County is included in the Lewiston-Auburn, Maine metropolitan New England City and Town Area while a different part of Oxford County is included in the Portland-South Portland-Biddeford, Maine metropolitan New England City and Town Area.