The Stockport South by-election was held on 3 February 1955. It was held due to the elevation to a hereditary peerage of the incumbent Conservative MP, Arnold Gridley. It was retained by the Conservative candidate, Harold Macdonald Steward.
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| Conservative | Harold Steward | 16,321 | 54.26 | +0.09 | |
| Labour | H Davies | 13,758 | 45.73 | -0.09 | |
| Majority | 2,563 | 8.53 | +0.18 | ||
| Turnout | 30,079 | ||||
| Conservative hold | Swing | ||||