Premiership of the Viscount Marloes
 | |
| Premiership of the Viscount Marloes 25 August 2025 – 28 September 2025 | |
| Monarch | George VII |
|---|---|
| Cabinet | First Marloes Ministry Second Marloes Ministry |
| Party | Unionist Party |
| Seat | 10 Downing Street |
 Coat of Arms of HM Government under George VII | |
Llywellyn Carew, The Viscount Marloes's first tenure as Prime Minister of Great Britain began on 25 August 2025, when he accepted an invitation from King George VII to form a government in his name, following his win in the August 2025 General Election. His Premiership occurred during the 41st Parliament of Great Britain. During this time, he also served as Leader of the Unionist Party and First Lord of the Treasury. He was the seventh Prime Minister of George VII, and the fifth to be elected in his reign. It was his first tenure as Prime Minister: the last time this had happened was during the following the election of Josephine Carew-Grey in July 2024. Llywellyn Carew was also the first to not previously serve in one of the Great Offices of State since the Elio Somerset was elected in January 2023.
On 26 August 2025, it was discovered there was a fraudulent voter and a new election was called. Forming a coalition with the Progressive Commonwealth Party and the League of Independent and Optimistic Nationals, the Prime Minister won a landslide victory and formed a new ministry.