United Kingdom general election, 1970 Opinion poll summary Opinion poll summary

| Party | Marplan | Gallup | National_Opinion_Polls_NOP | Opinion_Research_Centre_OPC | Harris |
|---|---|---|---|---|---|
| Conservative | 41.5% | 42.0% | 44.1% | 46.5% | 46.0% |
| Labour | 50.2% | 49.0% | 48.2% | 45.5% | 48.0% |
| Liberal | 7.0% | 7.5% | 6.4% | 6.5% | 5.0% |
| Others | 1.3% | 1.5% | 1.3% | 1.5% | 1.0% |
| Labour lead | 8.7% | 7.0% | 4.1% | -1.0% | 2.0% |
| Fieldwork dates | June 11–14 | June 14–16 | June 12–16 | June 13–17 | May 20 - June 16 |
| Sample size | 2267 | 2190 | 1562 | 1583 | 4841 |