The Lyttelton by-election of 1933 was a by-election held during the 24th New Zealand Parliament in the Christchurch electorate of Lyttelton. It is notable for being won by Elizabeth McCombs of the New Zealand Labour Party, who became the first woman to be elected to the New Zealand Parliament. This by-election was therefore seen as a milestone in Women's suffrage in New Zealand.

Elizabeth Reid McCombs (née Henderson, 19 November 1873 – 7 June 1935) was a New Zealand politician of the Labour Party who in 1933 became the first woman elected to the New Zealand Parliament. New Zealand women gained the right to vote in 1893, though were not allowed to stand for the House of Representatives until the election of 1919. McCombs had previously contested elections in 1928 and 1931.