A by-election was held for the British House of Commons constituency of Vale of Glamorgan on May 4, 1989 following the death of Conservative MP Sir Raymond Gower.
Eleven candidates stood, which remains the most in any Welsh by-election.
The result was a Labour gain.
| Vale of Glamorgan by-election | |||||
|---|---|---|---|---|---|
| Party | Candidate | Votes | % | ±% | |
| Labour | John Smith | 23,342 | 48.9 | +14.2 | |
| Conservative | Rod Richards | 17,314 | 36.3 | -10.5 | |
| Social and Liberal Democrats | F. Leavers | 2,017 | 4.2 | -12.5 | |
| Plaid Cymru | A. Dixon | 1,672 | 3.5 | +1.7 | |
| Social Democrat | D. Davies | 1,098 | 2.3 | ||
| Green | M. Wakefield | 971 | 2.0 | ||
| Protect the Health Service | C. Tiarks | 847 | 1.8 | ||
| Monster Raving Loony | David Sutch | 266 | 0.5 | ||
| Independent Welsh Socialist | E. Roberts | 148 | 0.3 | ||
| Corrective Party | Lindi St Claire | 39 | 0.1 | ||
| Christian Alliance | D. Black | 32 | 0.1 | ||
| Majority | 6,028 | 12.6 | |||
| Turnout | 70.7 | ||||
| Labour gain from Conservative | Swing | -12.35 | |||
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