Federated Conservationists of Westchester County
- Non-profit coalition of environmental groups dedicated to environmental preservation and education. Features a directory of Westchester environmental and community groups and an events calendar.
- http://www.fcwc.org/

Indian Point Safe Energy Coalition
- Science and safety information related to the Indian Point nuclear facility; online petition and various promotional materials.
- http://closeindianpoint.org/

Westchester Amateur Astronomers
- Non-profit organization providing opportunities to learn more about astronomy, including monthly lectures and stargazing events in Westchester.
- http://www.westchesterastronomers.org/

Westchester Geology Web Page
- Information about County geology, and extensive list of online geology resources.
- http://home.computer.net/~tmcguire/

Westchester Land Trust
- Dedicated to protecting open space and promoting responsible land use throughout the county.
- http://www.westchesterlandtrust.org/

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.
- http://www.wesef.org/