The 1939 Caerphilly by-election was a parliamentary by-election held on 4 July 1939 for the British House of Commons constituencyofCaerphilly.
Morgan Jones was the previous member of Parliament. He died on 23 April 1939. He was a conscientious objector during the First World War.
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| Labour | Morgan Jones | 24,846 | 76.2 | +8.6 | |
| Conservative | GT Stoneham | 7,738 | 23.8 | −8.6 | |
| Majority | 17,108 | 52.5 | +17.4 | ||
| Turnout | 32,584 | 72.3 | −4.3 | ||
| Registered electors | 45,057 | ||||
| Labour hold | Swing | ||||
Ness Edwards was a coal miner and during the first world war, a conscientious objector. Ronald Bell was a barrister, and later became a politician.
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| Labour | Ness Edwards | 19,847 | 68.0 | −8.2 | |
| Conservative | Ronald Bell | 9,349 | 32.0 | +8.2 | |
| Majority | 10,498 | 36.0 | −16.6 | ||
| Turnout | 29,196 | 68.4 | −3.9 | ||
| Registered electors | 42,678 | ||||
| Labour hold | Swing | ||||
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| Labour | Ness Edwards | 29,158 | 80.2 | +4.0 | |
| Conservative | John Frederick Manuel de Courcy | 7,189 | 19.8 | −4.0 | |
| Majority | 21,969 | 60.4 | +7.8 | ||
| Turnout | 36,347 | 77.2 | +4.9 | ||
| Registered electors | 47,078 | ||||
| Labour hold | Swing | ||||
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