The Thurrock by-election of 15 July 1976 was held after the death of Labour Member of Parliament (MP) Hugh Delargy. Labour held on to the seat in the by-election.
| Thurrock, 1976 | |||||
|---|---|---|---|---|---|
| Party | Candidate | Votes | % | ±% | |
| Labour | Oonagh McDonald | 22,191 | 45.27 | -10.30 | |
| Conservative | Percy Lomax | 17,352 | 35.39 | +10.95 | |
| Liberal | Anthony Charlton | 5,977 | 12.19 | -7.80 | |
| National Front | John Roberts | 3,255 | 6.64 | N/A | |
| English National | Frank Hansford-Miller | 187 | 0.38 | N/A | |
| World Grid Sunshine Room Party | Peter Bishop | 72 | 0.15 | N/A | |
| Turnout | 49,034 | ||||
| Labour hold | Swing | 10.6% from Labour to Conservative | |||
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