Ashton-under-Lyne by-election may refer to one of five by-elections held in the British House of Commons constituency of Ashton-under-Lyne, in Lancashire:
- Ashton-under-Lyne by-election, 1920
- Ashton-under-Lyne by-election, 1928
- Ashton-under-Lyne by-election, 1931
- Ashton-under-Lyne by-election, 1939
- Ashton-under-Lyne by-election, 1945
- See also
- Ashton-under-Lyne (UK Parliament constituency)