Rensselaerswyck was a Dutch colonial patroonship and later an English manor owned by the van Rensselaer family located in the present-day Capital District of New York in the United States.
The estate was originally deeded by the Dutch West India Company in 1630 to Kiliaen van Rensselaer, a Dutch merchant and one of the company's original directors. Rensselaerswyck extended for miles on each side of the Hudson River. It included most of the land that would later become the New York counties of Albany and Rensselaer, as well as parts of Columbia and Greene counties.
