Some of the organizations listed here attempt to influence policy and legislation regarding protected areas. Others serve as partners with protected area agencies, supporting them with information, volunteers, and other assistance. Both types of groups may also support research, management, and other professional functions in protected areas.

ORGANIZATIONS CONCERNED PRIMARILY WITH NATURAL RESOURCES

(1) BASED IN OR FOCUSED ON NORTH AMERICA

(2) BASED OR FOCUSED OUTSIDE OF NORTH AMERICA

A list of heritage preservation organizations is in the works.