The 1874 Monmouthshire by-election was fought on 17 March 1874. The by-election was fought due to the incumbent Conservative MP, Lord Henry Somerset, becoming Comptroller of the Household. It was retained, as expected, by the incumbent.
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| Conservative | Henry Somerset | Unopposed | |||
| Registered electors | 7,630 | ||||
| Conservative hold | |||||
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