The City of London by-election, 1924 was a parliamentary by-election held on 1 February 1924 for the British House of Commons constituency of City of London, which covered the "Square Mile" which was the United Kingdom's traditional financial district. The seat had become vacant on the elevation to the peerage of one of the constituency's two Conservative Members of Parliament (MPs), Sir Frederick Banbury, as Baron Banbury of Southam. Banbury had held the seat since a 1906 by-election, following his defeat at Peckham in the 1906 general election. He had represented Peckham since 1892.