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See the list at  LABYRINTH: Medieval Studies Organizations

 International Arthurian Society

IAS - North American Branch
Arthuriana

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 International Marie de France Society

Le Cygne

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 International Reynard Society / Société Internationale Renardienne

 Reinardus

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Société Internationale Rencesvals

British Branch
AMERICAN-CANADIAN BRANCH
Nederlandse afdeling

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Tristan Society

 International Medieval Institute, Leeds

The Medieval Institute at Western Michigan University

Centre d'Études Supérieures de Civilisation Médiévale, Poitiers

Centre d'Études des Textes Médiévaux, Université Rennes 2 Haute Bretagne