Hempstead Lake State Park is a 737-acre (2.98 km2) state park located in Nassau County, New York in the United States. The park is located in West Hempstead and is one of three state parks within the Town of Hempstead. There is a quick-access entrance at exit 18 from the Southern State Parkway. The park contains the largest freshwater lake in Nassau County.
The park offers picnic tables with pavilions, tennis courts, a playground, playing fields, recreation programs, hiking, biking, a bridle path, fishing, ice fishing, ice skating, cross-country skiing, snowmobiling, and a boat launch. The park contains three ponds for fishing that are stocked with several varieties of fish. Wooded picnic areas provide shade.