In the run up to the 2005 Portuguese legislative election, various organisations carried out opinion polling to gauge voting intention in Portugal. Results of such polls are displayed in this article.
The date range for these opinion polls are from the previous general election, held on 17 March 2002, to the day the next election was held, on 20 February 2005.
Poll results are listed in the table below in reverse chronological order, showing the most recent first. The highest percentage figure in each polling survey is displayed in bold, and the background shaded in the leading party's colour. In the instance that there is a tie, then no figure is shaded but both are displayed in bold. The lead column on the right shows the percentage-point difference between the two parties with the highest figures. Poll results use the date the survey's fieldwork was done, as opposed to the date of publication.
| Date Released | Polling Firm | Others | Lead | ||||||
|---|---|---|---|---|---|---|---|---|---|
| 20 Feb 2005 | 2005 legislative election | 45.0 121 seats | 28.8 75 seats | 7.2 12 seats | 7.5 14 seats | 6.4 8 seats | 5.1 0 seats | 16.2 | |
| 20 Feb (20:00) | Exit Poll - RTP1 Universidade Católica | 45.0–49.0 124 / 136 | 25.0–29.0 62 / 70 | 5.0–7.0 7 / 10 | 6.0–8.0 10 / 14 | 6.0–8.0 10 / 14 | - | 20.0 | |
| 20 Feb (20:00) | Exit Poll - SIC Eurosondagem | 46.9–50.7 123 / 130 | 23.3–27.1 65 / 75 | 6.1–7.9 9 / 13 | 7.5–9.3 14 / 16 | 6.1–7.9 8 / 9 | - | 23.6 | |
| 20 Feb (20:00) | Exit Poll - TVI Intercampus | 44.2–48.2 117 / 127 | 26.1–30.1 68 / 78 | 5.5–8.1 8 / 14 | 6.4–9.0 12 / 18 | 5.1–7.7 6 / 12 | - | 18.1 | |
| Exit polls | |||||||||
| 18 Feb 2005 | Aximage | 46.8 | 29.6 | 7.3 | 7.0 | 5.5 | 3.8 | 17.2 | |
| 18 Feb 2005 | Marktest | 46.0 | 26.8 | 7.5 | 8.9 | 7.7 | 3.1 | 19.2 | |
| 18 Feb 2005 | Eurosondagem | 45.0 | 30.6 | 7.7 | 7.7 | 5.7 | 3.3 | 14.4 | |
| 18 Feb 2005 | IPOM | 46.0 | 30.0 | 8.0 | 6.0 | 7.0 | 3.0 | 16.0 | |
| 18 Feb 2005 | Intercampus | 45.9 | 30.3 | 7.1 | 7.6 | 5.2 | 3.9 | 15.6 | |
| 17 Feb 2005 | TNS/Euroteste | 39.0 | 28.0 | 7.0 | 6.0 | 6.0 | 14.0 | 11.0 | |
| 17 Feb 2005 | Universidade Católica | 46.0 | 31.0 | 6.0 | 7.0 | 7.0 | 3.0 | 15.0 | |
| 12 Feb 2005 | Eurosondagem | 44.4 | 31.3 | 7.4 | 6.9 | 6.4 | 3.6 | 13.1 | |
| 11 Feb 2005 | Aximage | 44.7 | 27.4 | 6.4 | 7.1 | 4.8 | 9.6 | 17.3 | |
| 4 Feb 2005 | IPOM | 49.0 | 31.0 | 8.0 | 6.0 | 5.0 | 1.0 | 18.0 | |
| 4 Feb 2005 | Aximage | 43.5 | 29.3 | 7.0 | 5.6 | 3.5 | 11.1 | 14.2 | |
| 3 Feb 2005 | Intercampus | 46.5 | 31.6 | 4.8 | 8.1 | 4.5 | 4.5 | 14.9 | |
| 29 Jan 2005 | Eurosondagem | 46.1 | 32.1 | 7.0 | 6.6 | 4.6 | 3.6 | 14.0 | |
| 28 Jan 2005 | Marktest | 45.1 | 27.7 | 6.3 | 7.7 | 8.1 | 5.1 | 17.5 | |
| 28 Jan 2005 | Aximage | 43.3 | 27.4 | 6.3 | 5.8 | 5.0 | 12.2 | 15.9 | |
| 28 Jan 2005 | Universidade Católica | 46.0 | 28.0 | 6.0 | 8.0 | 8.0 | 4.0 | 18.0 | |
| 27 Jan 2005 | TNS/Euroteste | 40.0 | 32.0 | 6.0 | 4.0 | 5.0 | 13.0 | 8.0 | |
| 21 Jan 2005 | Aximage | 42.8 | 28.7 | 7.1 | 6.2 | 4.3 | 10.9 | 14.1 | |
| 15 Jan 2005 | Eurosondagem | 45.7 | 32.5 | 6.5 | 6.5 | 5.7 | 3.1 | 13.2 | |
| 10 Jan 2005 | Aximage | 45.6 | 27.5 | 6.6 | 6.6 | 3.4 | 10.3 | 18.1 | |
| 8 Jan 2005 | Eurosondagem | 46.0 | 33.0 | 6.9 | 6.3 | 4.5 | 3.3 | 18.1 | |
| 27 Nov 2004 | Universidade Católica | 46.0 | 35.0 | 3.0 | 7.0 | 6.0 | 3.0 | 11.0 | |
| Nov 2004 | Marktest | 49.3 | 32.4 | 2.1 | 6.4 | 5.8 | 4.0 | 16.9 | |
| Oct 2004 | Marktest | 49.3 | 28.4 | 3.3 | 8.2 | 6.7 | 4.1 | 20.9 | |
| 14 Sep 2004 | Aximage | 38.0 | 33.1 | 4.6 | 4.1 | 3.0 | 17.2 | 4.9 | |
| Sep 2004 | Marktest | 46.4 | 34.5 | 1.6 | 8.8 | 5.4 | 3.3 | 11.9 | |
| 16 Jul 2004 | Aximage | 39.5 | 31.7 | 4.2 | 4.8 | 3.5 | 16.3 | 7.8 | |
| Jul 2004 | Marktest | 45.4 | 36.8 | 2.7 | 6.3 | 5.7 | 3.1 | 8.6 | |
| 21 Jun 2004 | Aximage | 42.8 | 30.3 | 4.7 | 6.4 | 3.3 | 12.5 | 12.5 | |
| Jun 2004 | Marktest | 47.6 | 29.9 | 2.6 | 5.5 | 10.0 | 4.4 | 17.7 | |
| 13 Jun 2004 | 2004 EP election | 44.5 | 33.3 | 9.1 | 4.9 | 8.2 | 11.2 | ||
| 1 Jun 2004 | Aximage | 40.0 | 29.8 | 4.9 | 6.4 | 4.4 | 14.5 | 10.2 | |
| May 2004 | Marktest | 43.5 | 36.5 | 1.5 | 5.2 | 6.3 | 7.0 | 7.0 | |
| 24 Apr 2004 | Aximage | 40.1 | 30.6 | 5.6 | 5.3 | 2.4 | 16.0 | 9.5 | |
| Apr 2004 | Marktest | 41.9 | 36.5 | 2.6 | 7.3 | 6.9 | 4.8 | 5.4 | |
| 20 Mar 2004 | Aximage | 38.2 | 31.7 | 5.5 | 6.8 | 5.2 | 12.6 | 6.5 | |
| Mar 2004 | Marktest | 43.9 | 34.9 | 3.8 | 6.9 | 5.7 | 4.8 | 9.0 | |
| Feb 2004 | Marktest | 42.2 | 38.7 | 2.3 | 6.6 | 6.4 | 3.8 | 3.5 | |
| 17 Jan 2004 | Aximage | 38.6 | 36.5 | 4.4 | 4.6 | 3.8 | 12.1 | 2.1 | |
| 17 Jan 2004 | Eurosondagem | 35.2 | 34.2 | 5.5 | 4.9 | 4.5 | 15.7 | 1.0 | |
| Jan 2004 | Universidade Católica | 44.0 | 34.0 | 4.0 | 7.0 | 7.0 | 4.0 | 10.0 | |
| Jan 2004 | Marktest | 40.0 | 35.1 | 1.9 | 9.5 | 7.8 | 5.7 | 4.9 | |
| 21 Dec 2003 | Aximage | 35.5 | 29.4 | 5.2 | 6.5 | 5.2 | 18.2 | 6.1 | |
| 23 Nov 2003 | Aximage | 38.5 | 34.4 | 2.7 | 5.9 | 3.7 | 14.8 | 4.1 | |
| Nov 2003 | Marktest | 38.8 | 35.9 | 5.9 | 9.0 | 5.2 | 5.2 | 2.9 | |
| 20 Oct 2003 | Aximage | 36.7 | 34.4 | 4.6 | 24.3 | 2.3 | |||
| Oct 2003 | Marktest | 37.4 | 43.6 | 3.7 | 6.4 | 5.5 | 3.4 | 6.2 | |
| 6 Sep 2003 | Aximage | 34.6 | 38.4 | 4.8 | 4.7 | 17.5 | 3.8 | ||
| Sep 2003 | Marktest | 42.8 | 37.6 | 4.1 | 5.0 | 6.2 | 4.3 | 5.2 | |
| Jul 2003 | Marktest | 36.1 | 43.3 | 5.5 | 6.6 | 4.7 | 3.8 | 7.2 | |
| 24 Jun 2003 | Aximage | 40.7 | 38.6 | 3.9 | 5.6 | 2.6 | 8.6 | 2.1 | |
| Jun 2003 | Marktest | 36.0 | 40.9 | 7.7 | 6.7 | 4.7 | 4.0 | 4.9 | |
| 22 May 2003 | Aximage | 38.8 | 37.5 | 3.5 | 4.9 | 4.2 | 11.1 | 1.3 | |
| 19 May 2003 | Universidade Católica | 44.8 | 35.6 | 2.7 | 7.0 | 6.5 | 3.4 | 9.2 | |
| May 2003 | Marktest | 40.8 | 40.4 | 5.2 | 5.4 | 4.4 | 3.8 | 0.4 | |
| Apr 2003 | Aximage | 40.6 | 33.2 | 4.7 | 7.3 | 14.2 | 7.4 | ||
| Apr 2003 | Marktest | 45.2 | 34.7 | 5.5 | 6.7 | 4.0 | 3.9 | 10.5 | |
| 28 Mar 2003 | Marktest | 44.6 | 36.2 | 6.2 | 4.6 | 4.6 | 3.8 | 8.4 | |
| Mar 2003 | Aximage | 46.3 | 31.2 | 22.5 | 15.1 | ||||
| Feb 2003 | Aximage | 42.6 | 33.8 | 23.6 | 8.8 | ||||
| Feb 2003 | Marktest | 41.6 | 36.3 | 6.0 | 7.2 | 4.9 | 4.0 | 5.3 | |
| Jan 2003 | Aximage | 41.2 | 36.0 | 4.1 | 4.9 | 4.4 | 9.4 | 5.2 | |
| Jan 2003 | Marktest | 42.3 | 38.7 | 4.8 | 5.0 | 5.6 | 3.6 | 3.6 | |
| Nov 2002 | Marktest | 43.3 | 36.4 | 6.5 | 6.4 | 4.6 | 2.8 | 6.9 | |
| Oct 2002 | Marktest | 37.9 | 41.8 | 5.7 | 7.5 | 3.3 | 3.8 | 3.9 | |
| Sep 2002 | Marktest | 40.0 | 37.8 | 8.3 | 6.1 | 3.8 | 4.0 | 2.2 | |
| 8 Aug 2002 | Eurosondagem | 38.0 | 31.6 | 8.7 | 5.2 | 3.4 | 13.1 | 6.4 | |
| Jul 2002 | Marktest | 41.4 | 39.0 | 7.0 | 5.1 | 3.8 | 3.7 | 2.4 | |
| Jun 2002 | Marktest | 39.8 | 37.5 | 6.0 | 7.5 | 5.4 | 3.8 | 2.3 | |
| May 2002 | Marktest | 37.0 | 39.0 | 8.6 | 6.1 | 4.8 | 4.5 | 2.0 | |
| 17 Mar 2002 | 2002 legislative election | 37.8 96 seats | 40.2 105 seats | 8.7 14 seats | 6.9 12 seats | 2.7 3 seats | 3.7 3 seats | 2.4 | |