Fondation Dubuffet

A comprehensive list of museums and collections can be found in the Outsider Art Sourcebook From Raw Vision. Here are a few highlights:

Europe
Musee de l’Art Differencie (MAD musee) (Belgium)
Collection de L’Art Brut (Switzerland)
Adolf Wolfli Foundation (Switzerland)
House of Artists (Gallery Gugging) (Austria)
Lille Museum of Modern, Contemporary and Outsider Art (France)
Samlung Zander (Germany)
Prinzhorn Collection (Germany)
SørTroms Museum (Norway)

United States
American Folk Art Museum (New York)
American Visionary Art Museum (Baltimore)
Intuit: The Center for Intuitive and Outsider Art (Chicago)
John Michael Kohler Arts Center (Sheboygan, Wisconsin)