John Bartow Van Rensselaer was an American politician and a member of the prominent Van Rensselaer family, known for their influence in New York's history. He served as a member of the New York State Assembly and was involved in various local government roles during the 19th century. His contributions were significant in shaping the political landscape of his time. Born in 1798, Van Rensselaer was educated and raised in a family that played a crucial role in the development of the Hudson River Valley. He was also connected to the Dutchess County area, where his family owned extensive land. His legacy is tied to the broader history of New York State and its early governance.