Van Rensselaer Island was an island in the Hudson River opposite the city of Albany, New York. Today it is within the city of Rensselaer in Rensselaer County, and has been connected to the mainland on the east side and parts of the island's west side has been dredged away. The island has also been known as de Laet's Island, Kalebacker's Island, Boston Island and B&A Island, the last two names in reference to the Boston and Albany Railroad.