The Massachusetts Audubon Society, commonly known as Mass Audubon, founded in 1896 by Harriet Hemenway and Minna B. Hall and headquartered in Lincoln, Massachusetts, is a nonprofit organization dedicated to "protecting the nature of Massachusetts". Mass Audubon is independent of the National Audubon Society (NAS), and was founded earlier than the NAS. Mass Audubon protects more than 40,000 acres of land throughout Massachusetts, saving birds and other wildlife, and making nature accessible to all with its wildlife sanctuaries and 20 nature centers.

Lincoln is a town in Middlesex County, Massachusetts, United States. The population was 7,014 according to the 2020 United States Census, including residents of Hanscom Air Force Base who live within town limits. The town, located in the MetroWest region of Boston's suburbs, has a large amount of colonial history and a sizeable amount of public conservation land.