International 

The International Headache Society (IHS)

The European Headache Federation (EHF) 

 

National

The American Headache Society (AHS)

Headache Australia

The Migraine Trust (United Kingdom)

Die Deutsche Migräne- und Kopfschmerzgesellschaft (Germany)

Hoofdpijnpatienten (The Netherlands)

Spanish Headache Society (Spain)

Links to other Headache/Migraine Societies

 

Other

The International Headache Classification (ICHD-3 beta)