Ulster Park is a hamlet in Ulster County, New York, United States. The community is located near U.S. Route 9W and 5 miles (8.0 km) south of Kingston, in the town of Esopus. Ulster Park has a post office with ZIP code 12487, which opened on November 29, 1847.

Ulster Park was also home to Camp Chi-Wan-Da, a Jewish summer camp where Sandy Koufax, Baseball Hall of Fame pitcher for the Los Angeles Dodgers, spent his summers during his childhood and teenage years.