B.K.S. Iyengar Association of the Southeast
Supports Iyengar yoga teaching in the southeastern United States. Site lists certified teachers by state and provides membership information.
http://www.iyase.org/

InterMountain B.K.S. Iyengar Yoga Association
Organization of Iyengar-style teachers in Arizona, Colorado, Kansas, Nebraska, New Mexico, Utah and Wyoming. Site lists upcoming workshops in the region, provides membership information.
http://csyoga.com/imiya/

Art of Living D.C.
Chapter of the Art of Living Foundation offers courses in the Washington, D.C., Virginia and Maryland areas. Site also lists satsangs, visits from Sri Sri Ravi Shankar, community events, service projects.
http://www.artoflivingdc.org/

O2 Yoga
Studio with locations in Somerville, Massachusetts, and Rye, New Hampshire, emphasizes Astanga style yoga. Beginner level, mult-level and dance classes available.
http://www.o2yoga.com/

BKS Iyengar Yoga National Association of the United States
Search for certified teachers by state, become a member, and access links to yoga resources.
http://www.iynaus.org

Yoga Therapy Center
Offers classes, workshops, books and teacher training in Structural Yoga Therapy and Classical Yoga of Patanjali. Offerings throughout the US.
http://www.yogatherapycenter.org

Mid Atlantic Yoga Association (MAYA)
Membership organization for teachers and students to encourage the study and practice of yoga. Holds workshops, retreats, and provides information on yoga. Serves DC, DE, PA, VA, MD and other states.
http://www.mayayoga.org/

Yoga Family
Directory of centers in the nation, online store, explanation of styles, postures, meditation, pranayama and resource articles. List of organizations, retreats and corporate yoga programs. Information on three affiliated studios in MA and FL.
http://www.yogafamily.com/

Global Dance - Yoga Meets Dance
Teacher training and retreats with Beth Rigby and lists of instructors and classes in several U.S. states.
http://www.yogameetsdance.com

Kundalini Yoga New England
Directory of Kundalini yoga classes and teachers in New England including MA, VT, RI, CT, ME, and NH.
http://www.kundaliniyogane.com/Teacher

Yoga Awareness
Ted Surman teaches daily yoga, private lessons, retreats and workshops. Locations in Hawaii, California, Colorado, Virginia and India.
http://www.yogaawareness.com

Gloria Drayer
Conducts Yoga classes, workshops, and retreats in New Mexico, Hawaii, North Carolina, and Colorado. Location and schedule of classes, workshops, and retreats.
http://www.yogasimpleandsacred.com/

Shakta Kaur Khalsa
Offers Yoga classes tailor made for children in different locations in United states. Information about location, schedule and content.
http://www.childrensyoga.com/

Fitness Resource Associates: Needham
Locations in CA, OH, MA, NH - Two Hatha Yoga teacher training programs taught in the Viniyoga style. There is a 40 hour and a 200 hour certification.
http://www.frayoga.com/

Atma Yoga
Los Angeles, Detroit, New York City - Daily classes, workshops and a teacher training program. Style combines hatha flow, yin yoga, and kundalini/shakti.
http://www.yogamandir.com

Kali Ray TriYoga
Locations in California, Massachusetts and Pennsylvania. Flowing yoga classes for all levels, workshops, teacher training, retreats. Information on the practice, pranayama, chanting, meditation, vegan awareness, and associations.
http://triyoga.org/welcome.php