Teatown Lake Reservation is a nonprofit nature preserve and environmental education center in Westchester County, New York, in the United States. The reservation includes an 1,000-acre nature preserve and education center located in the Westchester towns of Yorktown, Cortlandt, and New Castle. About 25,000 people come each year to hike the preserve's 15 miles of trails, attend an education program, visit the Nature Center, or tour "Wildflower Island". Teatown's educators offer adult, family and children's programs to 20,000 participants annually, including nearly 6,000 schoolchildren and 700 summer camp students.


Known by locals simply as "Teatown", the organization works to conserve biodiversity, teach ecology and promote nature-friendly living. Located in the heart of the Lower Hudson Valley's Hudson Highlands bioregion, Teatown Lake Reservation's mission is to conserve open space, educate citizens about the environment, and involve the public in order to sustain the diversity of wildlife, plants and habitats for future generations.