Instituciones europeas
| Austria | Down-Syndrom Österreich → website |
| Belgium | Downsyndroom Vlaanderen → website |
| Croatia | Down Syndrome Centre Pula → website |
| Croatia | Croatian Down Syndrome Association, Zagreb → website |
| Czech Republic | DownSyndrom CZ → website |
| Denmark | Landsforeningen Downs Syndrom → website |
| France | Trisomie 21 France → website |
| France | Association Française pour la recherche sur la Trisomie 21 (AFRT) → website |
| Germany | Deutsches Down-Syndrom InfoCenter → website |
| Hungary | Down Association → website |
| Ireland | Down Syndrome Ireland → website |
| Kosovo | Down Syndrome Association of Kosova → website |
| Luxembourg | Trisomie 21 → website |
| the Netherlands | Stichting Downsyndroom (SDS) → website |
| Norway | Norsk Nettverk for Down Syndrom → website |
| Poland | Stowarzyszenie Razem - Organizacja Pożytku Publicznego - Zespół Downa → website |
| Portugal | Associação Portuguesa de Portadores de Trissomia 21 → website |
| Russia | Downside Up → website |
| Spain | Fundación Iberoamericana Down21 → website |
| Spain | DownCiclopedia → website |
| Spain | Fundación Síndrome de Down de Madrid→ website |
| Spain | Revista síndrome de Down Vida Adulta → website |
| Spain | Down España → website |
| Sweden | Svenska Downföreningen → website |
| Switzerland | Insieme 21 → website |
| Turkey | Down Sendromu Dernegi → http://www.downturkiye.com/ |
| Ukraine | Ukrainian Down Syndrome Organization → website |
| United Kingdom | Down's Syndrome Association → website |
