European Charter for Regional or Minority Languages
This treaty aims to protect and promote the historical regional or minority languages of Europe. It was adopted, on the one hand, in order to maintain and to develop the Europe's cultural traditions and heritage, and on the other, to respect an inalienable and commonly recognised right to use a regional or minority language in private and public life.
Council of Europe webpage for Regional or Minority Languages
Albania
Andorra
Armenia
Austria
Azerbaijan
Belgium
Bosnia and Herzegovina
Bulgaria
Croatia
Cyprus
Czech Republic
Denmark
Estonia
Finland
France
Georgia
Germany
Greece
Hungary
Iceland
Ireland
Italy
Latvia
Liechtenstein
Lithuania
Luxembourg
Malta
Monaco
Montenegro
Netherlands
North Macedonia
Norway
Poland
Portugal
Republic of Moldova
Romania
Russian Federation
San Marino
Serbia
Slovak Republic
Slovenia
Spain
Sweden
Switzerland
Türkiye
Ukraine
United Kingdom