The 1920 Ashton-under-Lyne by-election was a by-election held on 31 January 1920 for the British House of Commons constituency of Ashton-under-Lyne. The by-election was triggered by the elevation to the peerage of the town's Conservative Party Member of Parliament (MP) Albert Stanley, who was ennobled as Baron Ashfield. The result was a victory for the Conservative candidate Sir Walter de Frece, who held the seat with a massively reduced majority.