ATNI is a nonprofit organization representing 57 Northwest tribal governments from Oregon, Idaho, Washington, southeast Alaska, Northern California and Western Montana. ATNI is an organization whose foundation is composed of the people it is meant to serve.
 
In acting upon these principles ATNI has taken as its purpose to: provide a forum for sharing information on matters of interest to its member Tribes, develop consensus on matters of mutual importance, assist member Tribes in their governmental and programmatic development consistent with their goals for self-determination and self-sufficiency and provide for effective public relations and education program with the non-Indian communities. 
 
ATNI Annual Conventions are a place to gather, learn, develop policy positions and share knowledge.