The 1955 United Kingdom general election was held on Thursday 26 May 1955, four years after the previous general election in 1951. It was a snap election: after Winston Churchill retired in April 1955, Anthony Eden took over and immediately called the election in order to gain a mandate for his government. It resulted in a majority of 60 seats for the government; the result remains the largest party share of the vote at a post-war general election. This was the first general election to be held during the reign of Elizabeth II. She had succeeded her father George VI the year after the previous election.

The 1951 United Kingdom general election was held twenty months after the 1950 general election, which the Labour Party had won with a slim majority of just five seats. The Labour government called a snap election for Thursday 25 October 1951 in the hope of increasing its parliamentary majority. However, despite winning the popular vote and achieving both the highest-ever total vote at the time and the highest percentage vote share, Labour won fewer seats than the Conservative Party. That was caused mainly by the collapse of the Liberal vote, which enabled the Conservatives to win seats by default. The record high vote total remained until it was surpassed by the Conservative Party in 1992 and again in 2019.