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 12, 2005 | Eurosondagem | 44.4% | 31.3% | 7.4% | 6.9% | 6.4% | 13.1% |
| February 11, 2005 | Aximage | 44.7% | 27.4% | 6.4% | 7.1% | 4.8% | 17.3% |
| February 4, 2005 | IPOM | 49.0% | 31.0% | 8.0% | 6.0% | 5.0% | 18.0% |
| February 4, 2005 | Aximage | 43.5% | 29.3% | 7.0% | 5.6% | 3.5% | 14.2% |
| February 3, 2005 | INTERCAMPUS | 46.5% | 31.6% | 4.8% | 8.1% | 4.5% | 14.9% |
| January 29, 2005 | Eurosondagem | 46.1% | 32.1% | 7.0% | 6.6% | 4.6% | 14.0% |
| January 28, 2005 | Marktest | 45.1% | 27.7% | 6.3% | 7.7% | 8.1% | 17.5% |
| January 28, 2005 | Aximage | 43.3% | 27.4% | 6.3% | 5.8% | 5.0% | 15.9% |
| January 28, 2005 | Universidade Católica | 46.0% | 28.0% | 6.0% | 8.0% | 8.0% | 18.0% |
| January 27, 2005 | TNS/Euroteste | 40.0% | 32.0% | 6.0% | 4.0% | 5.0% | 8.0% |
| January 21, 2005 | Axiamge | 42.8% | 28.7% | 7.1% | 6.2% | 4.3% | 14.1% |