[[File:Commonwealth realms map.svg|thumb|upright=1.35|
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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.
, 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".
List
There are currently 15 Commonwealth realms scattered across three continents (nine in North America, five in Oceania, and one, the UK, in Europe). Together, these realms have a population of more than 150 million<!-- 2020 --> and a combined land area of .
{| class="wikitable sortable"
|-
! Country
! Population ()
! Date
! Governor-general
! Prime minister
|-
| data-sort-value="Antigua and Barbuda" | (monarchy)
| style="text-align:right;"|
| 1981
| Rodney Williams
| Gaston Browne
|-
| data-sort-value="Australia" | (monarchy)
| style="text-align:right;"|
| data-sort-value="1901"|1901
| Sam Mostyn
| Anthony Albanese
|-
| data-sort-value="Bahamas" | (monarchy)
| style="text-align:right;"|
| 1973
| Cynthia A. Pratt
| Philip Davis
|-
| data-sort-value="Belize" | (monarchy)
| style="text-align:right;"|
| data-sort-value="1981"| 1981
| Froyla Tzalam
| Johnny Briceño
|-
| data-sort-value="Canada" | (monarchy)
| style="text-align:right;"|
| data-sort-value="1867"| 1867
| Mary Simon
| Mark Carney
|-
| data-sort-value="Grenada" | (monarchy)
| style="text-align:right;"|
| 1974
| Cécile La Grenade
| Dickon Mitchell
|-
| data-sort-value="Jamaica" | (monarchy)
| style="text-align:right;"|
| data-sort-value="1962"| 1962
| Patrick Allen
| Andrew Holness
|-
| data-sort-value="New Zealand" | (monarchy)
| style="text-align:right;"|
| data-sort-value="1907"| 1907
| Cindy Kiro
| Christopher Luxon
|-
| data-sort-value="Papua New Guinea" | (monarchy)
| style="text-align:right;"|
| data-sort-value="1975"| 1975
| Bob Dadae
| James Marape
|-
| data-sort-value="Saint Kitts and Nevis" | (monarchy)
| style="text-align:right;"|
| 1983
| Marcella Liburd
| Terrance Drew
|-
| data-sort-value="Saint Lucia" | (monarchy)
| style="text-align:right;"|
| 1979
| Errol Charles
| Philip J. Pierre
|-
| data-sort-value="Saint Vincent and the Grenadines" | (monarchy)
| style="text-align:right;"|
| 1979
| Stanley John
| Godwin Friday
|-
| data-sort-value="Solomon Islands" | (monarchy)
| style="text-align:right;"|
| 1978
| David Tiva Kapu
| Matthew Wale
|-
| data-sort-value="Tuvalu" | (monarchy)
| style="text-align:right;"|
| 1978
| Tofiga Vaevalu Falani
| Feleti Teo
|-
| data-sort-value="United Kingdom" | (monarchy)
| style="text-align:right;"|
| data-sort-value="1801"| 1801
| None
| Keir Starmer
|}
Interrelationship
The Commonwealth realms are sovereign states. They are united only in their voluntary connection with the institution of the monarchy, the succession, and the King himself; the person of the sovereign and the Crown were said in 1936 to be "the most important and vital link" between the dominions. Political scientist Peter Boyce called this grouping of countries associated in this manner "an achievement without parallel in the history of international relations or constitutional law." Terms such as personal union, a form of personal union, among others,