American Society for Quality (ASQ)
AQQ is a non-profit based out of Milwaukee, Wisconsin. It lists its mission as:
ASQ empowers people, communities, and organizations of the world to achieve excellence through quality.
ASQ claims members in 130+ countries. It is difficult to find current enrollment numbers, but it reportedly had 80,000 members in 2013.
It offers quality focused resources and training to improve individual expertise as well as organizational excellence.