Westchester Amateur Astronomers: Non-profit organization providing opportunities to learn more about astronomy, including monthly lectures and stargazing events in Westchester.
Westchester Geology Web Page: Information about County geology, and extensive list of online geology resources.
Westchester Land Trust: Dedicated to protecting open space and promoting responsible land use throughout the county.
Westchester Science and Engineering Fair: A regional science competition for Westchester County High School students. Students compete for entry to the International Science and Engineering Fair. Includes judging categories and forms.