David Lloyd George Liberal Seaborne Davies Liberal The 1945 Caernarvon Boroughs by-election was a parliamentary by-election held on 26 April 1945 for the British House of Commons constituency of Caernarvon Boroughs.

During a long and distinguished political career the former MP had served in many high offices, notably as Chancellor of the Exchequer 1908–1915 and Prime Minister of the United Kingdom 1916–1922.

Accordingly, the Liberal Party nominated a candidate, but no Labour or Conservative representative was put forward.

Plaid Cymru, which was not party to the electoral agreement, selected a candidate; so a contested poll took place.

After winning the by-election, he served in Parliament between April and July 1945 only, as he was defeated by a Conservative candidate in the 1945 United Kingdom general election.