Portuguese legislative election, 2005 Opinion Polling 116 seats needed for a majority

| Date_Released | Polling_institute | Socialist | Social_Democratic | Peoples_Party | Green_Communist | Left_Bloc | Lead_ |
|---|---|---|---|---|---|---|---|
| February 20, 2005 | Election Results | 45.0% 121 seats | 28.8% 75 seats | 7.2% 12 seats | 7.5% 14 seats | 6.4% 8 seats | 16.2% |
| February 18, 2005 | Aximage | 46.8% | 29.6% | 7.3% | 7.0% | 5.5% | 17.2% |
| February 18, 2005 | Marktest | 46.0% | 26.8% | 7.5% | 8.9% | 7.7% | 19.2% |
| February 18, 2005 | Eurosondagem | 45.0% | 30.6% | 7.7% | 7.7% | 5.7% | 14.4% |
| February 18, 2005 | IPOM | 46.0% | 30.0% | 8.0% | 6.0% | 7.0% | 16.0% |
| February 18, 2005 | INTERCAMPUS | 45.9% | 30.3% | 7.1% | 7.6% | 5.2% | 15.6% |
| February 17, 2005 | TNS/Euroteste | 39.0% | 28.0% | 7.0% | 6.0% | 6.0% | 11.0% |
| February 17, 2005 | Universidade Católica | 46.0% | 31.0% | 6.0% | 7.0% | 7.0% | 15.0% |