From Meta, a Wikimedia project coordination wiki
Interchapter groups are partnerships of Wikimedia chapters, formal or informal, organized around either long-term partnerships or specific conferences.
Interchapter groups and conferences 
- Wikimedia Chapters Association (formerly known as Chapters Council), a proposed central organization for chapters intended to promote coordination and accountability.
- Regional Cooperation Initiative for Ibero-America (Iberocoop)
- Wikimedia United States Chapters Council
- Central and Eastern European Wikimedia Group
- Wikimedia Asia Project, a regional cooperation initiative for chapters and working groups in Asia and Australia.
- Nordic Wikimedia
- Chinese Wikimedia Conference
- Turkic Wikimedia Conference 2012
- Francocoop (temporary name), an emerging cooperation of French-speaking Wikimedians
- WikiCon Germanophone conference
- WikiIndaba African conference
Ideas for groups:
- "Regional Cooperation" at Wikimedia Conference 2012 (originally from etherpad, mainly in Spanish)