East Greenbush is a town in Rensselaer County, New York, United States. It is a suburb of Albany. The population was 16,748 at the 2020 census. The word Greenbush is derived from the Dutch het groen bosch, referring to the pine woods that originally covered the land. The first settlement of the land now known as East Greenbush was made by tenants under patroon Kiliaen van Rensselaer circa 1630. The town was established in 1855 as Clinton, and was renamed in 1858. It is mostly suburban along its major highways and rural in the southwestern and northeastern corners.

Rensselaer County is a county in the U.S. state of New York. As of the 2020 census, the population was 161,130. Its county seat is Troy. The county is named in honor of the family of Kiliaen van Rensselaer, the original Dutch owner of the land in the area. The county is part of the Capital District region of the state.