The Washington Native Plant Society (WNPS) is a non-profit organization dedicated to the protection and appreciation of the native plants of the U.S. state of Washington. The society has participated with the state and local government agencies, as a non-governmental organization, for the protection of species, their habitats, and general environmental quality. WNPS also works in cooperation with other non-profit groups, such as the Seattle Audubon Society, for public education and advocacy in matters of mutual interest.