The Bournemouth by-election of 1945 was held on 15 November 1945. The by-election was held due to the elevation to hereditary peerage of the incumbent Conservative MP, Sir Leonard Lyle. It was won by the Conservative candidate Brendan Bracken, who was a prominent supporter of Winston Churchill and Conservative parliamentarian who had lost his Paddington North seat to Labour in the 1945 Labour landslide. Somewhat unusually, there was a significant swing to the governing party, with Labour achieving a swing of more than 10%.