A Commonwealth organisation is an organisation affiliated with the Commonwealth of Nations. This article is a list of such organisations, which include societies, institutions, associations, organisations, funds and charities that support the Commonwealth.
In some cases, such as Sight Savers International and the English-Speaking Union, they also operate outside the Commonwealth, though their operations began and largely remain within.
The Commonwealth of Nations, often referred to as the British Commonwealth or simply the Commonwealth, is an international association of 56 member states, the vast majority of which are former territories of its predecessor, the British Empire. They are connected through their use of the English language and their cultural and historical ties. Its chief institutions are the Commonwealth Secretariat, focusing on intergovernmental relations, and the Commonwealth Foundation, focusing on non-governmental relations between member nations. Additionally, numerous intergovernmental and civil organisations operating amongst the Commonwealth countries are officially recognised by the Secretariat.
The Commonwealth dates back to the first half of the 20th century, with the decolonisation of the Empire through the increased self-governance of its territories. It was created as the British Commonwealth of Nations through the Balfour Declaration at the 1926 Imperial Conference, and formalised by the United Kingdom through the Statute of Westminster in 1931. In 1949, the London Declaration allowed India to remain in the Commonwealth as a republic, marking a significant evolution for the association.