List of prime ministers of Charles III

Charles III is head of state of 15 Commonwealth realms and has had 21 prime ministers throughout his reign. Within the Westminster system in each realm, the King's government is headed by a prime minister. Appointment and dismissal of prime ministers are common reserve powers that can be exercised by the King or his governors-general. To date, Charles has appointed seven new prime ministers, the first being Rishi Sunak as Prime Minister of the United Kingdom on 25 October 2022 and the most recent being Sir Keir Starmer to the same office on 5 July 2024.

This list does not cover Commonwealth nations that are not Commonwealth realms, as Charles is not head of state in these nations. Nor does it cover holders of offices of prime minister in sub-national entities such as states, dependencies, or provinces.

Realm of New Zealand
The Realm of New Zealand comprises three autonomous jurisdictions: New Zealand and its associated states of the Cook Islands and Niue. As King of New Zealand Charles is the monarch of the entire realm.

New Zealand
Jacinda Ardern was the incumbent prime minister when Charles became King.

Solomon Islands
Manasseh Sogavare was the incumbent prime minister when Charles became King.

Tuvalu
Kausea Natano was the incumbent prime minister when Charles became king.

United Kingdom
Liz Truss was the incumbent prime minister when Charles became king.