The National Association of Social Workers (NASW), founded October 1, 1955, is the largest and most recognized membership organization of Professional social workers in the world. Representing members from 55 chapters in the United States and abroad, the Association promotes, develops, and protects the practice of social work and social workers. The NASW Montana Chapter is a state chapter of the NASW. As of early 2023, the Montana Chapter had approximately 600 members.