1966 General Election - South West Hertfordshire
| Year | 1966 |
| General election | 1966 General Election |
| Constituency | South West Hertfordshire |
| Turnout | 83.1% |
Results
| Candidate | Party | Votes |
| Longden, Sir Gilbert | Conservative | 28,378 |
| Chapman, John | Labour | 25,186 |
| Benton, Peter | Liberal | 8,590 |