ImprovWorks
- A nonprofit theater arts organization. Information on performances, classes, and workshops. San Francisco.
- http://www.improvworks.org/

Joya Cory Workshops
- Beyond comedy improv, this training activates full emotional and physical range to create tmmediate theatre of authenticity and substance.
- http://www.joyacory.com/

Staircase, The
- Improv explanations and details about structure. Information about performances, workshops, and bookings.
- http://www.staircase.org/

Spolin Center, The
- Dedicated to promoting Viola Spolin. News, articles, links and audios.
- http://www.spolin.com/

Paul Sills' Wisconsin Theater Game Center
- Teaches theater improv based on the work of Viola Spolin. Located in Door County Wisconsin.
- http://www.paulsills.com/

Improv Etc.
- Introductory workshops to advanced classes in New York. Information on teachers and the process.
- http://www.improvetc.com/