Member Nations (with date of membership)
| Antigua and Barbuda | 1981 |
| Australia | 1931 |
| Bahamas | 1973 |
| Bangladesh | 1972 |
| Barbados | 1966 |
| Belize | 1981 |
| Botswana | 1966 |
| Brunei | 1984 |
| Cameroon | 1995 |
| Canada | 1931 |
| Cyprus | 1961 |
| Dominica | 1978 |
| Fiji | 1971 (left in 1987; rejoined 1997) |
| Gambia | 1965 |
| Ghana | 1957 |
| Grenada | 1974 |
| Guyana | 1966 |
| India | 1947 |
| Jamaica | 1962 |
| Kenya | 1963 |
| Kiribati | 1979 |
| Lesotho | 1966 |
| Malawi | 1964 |
| Maldives | 1982 |
| Malaysia (formerly Malaya) | 1957 |
| Malta | 1964 |
| Mauritius | 1968 |
| Mozambique | 1995 |
| Namibia | 1990 |
| Nauru | 1968 |
| New Zealand | 1931 |
| Nigeria | 1960 |
| Pakistan | 1947 |
| Papua New Guinea | 1975 |
| Saint Kitts and Nevis | 1983 |
| Saint Lucia | 1979 |
| Saint Vincent and the Grenadines | 1979 |
| Samoa (formerly Western Samoa) | 1970 |
| Seychelles | 1976 |
| Sierra Leone | 1961 |
| Singapore | 1965 |
| Solomon Islands | 1978 |
| South Africa | 1931 (left in 1961; rejoined 1994) |
| Sri Lanka (formerly Ceylon) | 1948 |
| Swaziland | 1968 |
| Tanzania | 1961(As Tanganyika; became Tanzania in 1964 after union with Zanzibar) |
| Tonga | 1970 |
| Trinidad and Tobago | 1962 |
| Tuvalu | 1978 |
| Uganda | 1962 |
| United Kingdom | 1931 |
| Vanuatu | 1980 |
| Zambia | 1964 |
| Zanzibar | 1963 (United with Tanganyika to form Tanzania) |
