1987 General Election - Monmouth
| Year | 1987 |
| General election | 1987 General Election |
| Constituency | Monmouth |
| Turnout | 80.6% |
Results
| Candidate | Party | Votes |
| Thomas, Sir John | Conservative | 22,387 |
| Gass, Katrina | Labour | 13,037 |
| Lindley, Clive | Social Democratic | 11,313 |
| Meredudd, Sian | Plaid Cymru | 363 |