Friends of Cherry Lawn Park - Volunteer group of residents dedicated to preserving the public park. - http://foclp.darien.org/
Darien Environmental Group - Nonprofit volunteer organization established to educate residents about ways in which they can change consumer and lifestyle habits to benefit the environment. - http://www.darienenvironmentalgroup.org/
Darien Audubon Society - Organization overview, newsletter and information on field trips, special events, speaking programs, projects and birding areas. - http://audubon.darien.org/
Darien Land Trust - Land conservation agency which acquires and maintains areas of the town to be held as open space for the benefit of the community. - http://dlt.darien.org/