1857 General Election - South Northamptonshire
| Year | 1857 |
| General election | 1857 General Election |
| Constituency | South Northamptonshire |
| Turnout | 60.2% |
Results
| Candidate | Party | Votes |
| Spencer, John Poyntz | Whig | 2,107 |
| Knightley, Rainald | Conservative | 1,932 |
| Howard-Vyse, Richard Henry Richard | Conservative | 1,593 |