2005 French EU Constitution Referendum
2005 French Referendum on EU Constitution
| Survey End Date | Oui (%) | Non (%) | Net | |
| CSA | 16/05/05 | 49 | 51 | -2 |
| Ipsos | 14/05/05 | 49 | 51 | -2 |
| Ifop | 13/05/05 | 46 | 54 | -8 |
| TNS Sofres | 12/05/05 | 47 | 53 | -6 |
| TNS Sofres | 10/05/05 | 52 | 48 | +4 |
| CSA | 09/05/05 | 51 | 49 | +2 |
| Ipsos | 07/05/05 | 50 | 50 | 0 |
| Ifop | 04/05/05 | 50 | 50 | 0 |
| CSA | 02/05/05 | 51 | 49 | +2 |
| Ipsos | 30/04/05 | 53 | 47 | +6 |
| Ifop | 28/04/05 | 48 | 52 | -4 |
| TNS Sofres | 28/04/05 | 52 | 48 | +4 |
| CSA | 27/04/05 | 49 | 51 | -2 |
| Ipsos | 23/04/05 | 48 | 52 | -4 |
| TNS Sofres | 18/04/05 | 45 | 55 | -10 |
| Ipsos | 16/04/05 | 45 | 55 | -10 |
| CSA | 15/04/05 | 44 | 56 | -12 |
| Ifop | 15/04/05 | 44 | 56 | -12 |
| CSA | 13/04/05 | 45 | 55 | -10 |
| Ipsos | 09/04/05 | 47 | 53 | -6 |
| CSA | 07/04/05 | 46 | 54 | -8 |
| TNS Sofres | 02/04/05 | 47 | 53 | -6 |
| Ifop | 01/04/05 | 45 | 55 | -10 |
| CSA | 31/03/05 | 47 | 53 | -6 |
| Ipsos | 26/03/05 | 46 | 54 | -8 |
| Ifop | 24/03/05 | 47 | 53 | -6 |
| Ipsos | 19/03/05 | 48 | 52 | -4 |
| TNS Sofres | 10/03/05 | 56 | 44 | +12 |
| Ipsos | 05/03/05 | 60 | 40 | +20 |
| Ifop | 04/03/05 | 58 | 42 | +16 |
| Ifop | 04/02/05 | 61 | 39 | +22 |