Western National Parks Association (WNPA) is a non-profit membership organization authorized by Congress to aid and promote educational and scientific activities within more than 70 park sites in the American southwest. 

WNPA has roots that stretch back to 1938 when a need was recognized for continuing the public's interest and education in their national parks. Since then, they have helped millions to understand more of their natural and cultural history. They publish numerous trail guides, books and other materials that would otherwise be unavailable to the public.