Commonwealth realm

A Commonwealth realm is a sovereign state in the Commonwealth of Nations that has the same constitutional monarch and head of state as the other realms. The current monarch is King Charles III. Except for the United Kingdom, in each of the realms the monarch is represented by a governor-general. The phrase Commonwealth realm is an informal description not used in any law.

As of 2026, there are 15 Commonwealth realms: Antigua and Barbuda, Australia and its external territories, The Bahamas, Belize, Canada, Grenada, Jamaica, the Realm of New Zealand, Papua New Guinea, Saint Kitts and Nevis, Saint Lucia, Saint Vincent and the Grenadines, Solomon Islands, Tuvalu, and the United Kingdom and its territories. While the Commonwealth of Nations has 56 independent member states, only these 15 have Charles III as head of state. He is also Head of the Commonwealth, a ceremonial role.

The notion of these states sharing the same person as their monarch traces back to 1867 when Canada became the first "dominion": a largely self-governing nation that was nevertheless a part of the British Empire. Others, such as Australia (1901) and New Zealand (1907), followed. With the growing independence of the dominions in the 1920s, the Balfour Declaration of 1926 established the Commonwealth of Nations and that the nations were considered "equal in status ... though united by a common allegiance to the Crown". The Statute of Westminster 1931 further set the terms: of the relationship between the realms; and of their broader sharing of the monarch, including a convention that any alteration to the line of succession in any one country must be voluntarily approved by all the others.

After the significant and costly mutual defence assistance provided by empire nations during the Second World War, the modern Commonwealth of Nations was formally constituted by the London Declaration. In 1950, India became a republic without leaving the Commonwealth. This left seven independent nations sharing the Crown: Australia, Canada, Ceylon (now Sri Lanka), New Zealand, Pakistan, South Africa, and the United Kingdom. Since then, new realms have been created as former colonies and dependencies have gained independence. Saint Kitts and Nevis is the youngest extant realm, having achieved independence—while retaining the monarch—in 1983. Some former realms have transitioned to presidentialrepublics: most recently, Barbados changed from realm to republic in 2021.