Argentina

Multifamilias (Foundation)

Padres Multiples (Families of Multiples)

Australia

Australian Multiple Birth Association (AMBA)

Australian Multiple Birth Association NSW

Lower North Shore Multiple Birth Association

Brazil

Multiplos

Canada

Multiple Births Canada (MBC)

Czech Republic

Czech and Moravian Twins and Multiple Birth Clubs

Denmark

Nordic Twinnet

Finland

Association of Finnish Triplet Families

Finnish Multiple Births Association

France

Federation Jumeaux et Plus

Germany

ABC Club

Hong Kong

Hong Kong Mother of Multiples

Hungary

Ikresek

Ireland

Irish Multiple Birth Association

Israel

Twins and Triplet Association

Italy

Italian Parents of Twins and Multiples Association - Il Mondo dei Gemelli

Japan

Japanese Association of Twins' Mothers

Mexico

Association de Nacimientos Multiples

Netherlands

Dutch Association for Parents of Multiple Births (DAPMB)

Twinspiratie

New Zealand

Multiples NZ

Nigeria

Worldwide Twins and Multiple Births Foundation Inc. (no website)

Norway

Norwegian Multiple Birth Organization

Puerto Rico

Multiple Birth Club

Sierra Leone

Multiple Birth Foundation (no website)

Singapore

Twins Plus Singapore Club

South Africa

The South African Multiple Births Association

Spain

Partos Multiples

Sri Lanka

Multiple Birth Foundation of Sri Lanka

Sri Lanka Twin Registry

Sweden

Swedish Twin Society

Svenska Trillingforeningen

Switzerland

Association Jumeaux

United Kingdom

Multiple Birth Foundation

Twins and Multiple Birth Association (TAMBA)

United States of America

National Organization of Mothers of Twins Clubs (NOMOTC)

Mothers of Supertwins (MOST)

Triplet Connection

The Centre for Study for Multiple Births

Center for Loss in Multiple Birth (CLIMB)