Greenbush, officially the Town of Greenbush, is a town in Penobscot County, Maine, on the Penobscot River. The town's population was 1,491 at the 2010 United States Census.

According to the United States Census Bureau, the town has a total area of 43.96 square miles (113.86 km²), of which, 43.80 square miles (113.44 km²) of it is land and 0.16 square miles (0.41 km²) is water.

As of the census of 2010, there were 1,491 people, 602 households, and 406 families residing in the town. The population density was 34.0 inhabitants per square mile (13.1/km²). There were 725 housing units at an average density of 16.6 per square mile (6.4/km²). The ethnic makeup of the town was 94.2% White, 0.3% African American, 2.0% Native American, 0.3% Asian, and 3.3% from two or more races. Hispanic or Latino of any race were 0.3% of the population.

There were 602 households of which 33.6% had children under the age of 18 living with them, 53.3% were married couples living together, 8.5% had a female householder with no husband present, 5.6% had a male householder with no wife present, and 32.6% were non-families. 23.3% of all households were made up of individuals and 5.5% had someone living alone who was 65 years of age or older. The average household size was 2.48 and the average family size was 2.88.

The median age in the town was 40.2 years. 23.1% of residents were under the age of 18; 8% were between the ages of 18 and 24; 27.1% were from 25 to 44; 32.8% were from 45 to 64; and 9% were 65 years of age or older. The gender makeup of the town was 49.6% male and 50.4% female.

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