The 2005–06 season in Portuguese football saw Porto, led by Co Adriaanse, clinch their 21st title and win the Taça de Portugal. Sporting CP secured second place, which gives them a direct entrance into next season's UEFA Champions League. Benfica had a disappointing season, although they returned to the spotlight of European football with a good run in the Champions League, reaching the quarter-finals.
Braga and Nacional challenged Sporting CP, Benfica and Porto for a major part of the season. Nacional, in particular, broke up "Big Three" for most of the season, defeating Sporting 2–1 at home in a memorable victory before ultimately falling away towards the end of the season. Braga finished the season in fourth place and Nacional finished fifth in the table after having slipped all the way to seventh at one point. Two famous Portuguese clubs, Vitória de Guimarães and Belenenses, were relegated.
Also of note was the suspension of Benfica midfielder Nuno Assis after testing positive for a banned substance in a league match http://www.uefa.com/uefa/Keytopics/kind=1/newsId=395716.html. This positive test has been challenged very aggressively by Benfica's management, as the tests seem to have failed to follow proper procedures http://www.correiodamanha.pt/noticia.asp?id=204276&idselect=12&idCanal=12&p=200, as 72 hours passed between the collection of the sample and the tests.
Early in the season, Benfica won the SuperCup Cândido de Oliveira in a match against previous cup winner Vitória de Setúbal.
In European club competitions, Benfica reached the quarter-finals of the Champions League after eliminating Manchester United in the group phase and title-holders Liverpool in the last-32, only to be eliminated in the quarter-finals by eventual Champions Barcelona. Meanwhile, Porto had a relatively poor European season, failing to qualify through the group stage and finishing fourth in their group, missing out in a spot in the 2005–06 UEFA Cup final phase. Sporting was eliminated in the third qualifying round of the Champions League by Udinese and, after demotion to qualification for the UEFA Cup, was eliminated at the hands of Halmstads BK. All Portuguese teams failed to qualify for the group stage of the UEFA Cup save for Vitória de Guimarães, which surpassed Wisła Kraków but failed to progress past the group stages.
In international football, the Portugal national team secured a place in Germany's 2006 FIFA World Cup, where they were grouped alongside Mexico, Iran and newcomer Angola.
| Competition | Winner | |
|---|---|---|
| Liga | Porto | |
| Taça de Portugal | Porto | |
| Portuguese SuperCup | Benfica | |
| Liga de Honra | Beira-Mar | |
| Segunda Divisão | Trofense (A) Lousada (B) Oliveirense (C) Olivais e Moscavide (D) | |
| Terceira Divisão | Maria da Fonte (A) Vila Meã (B) União Lamas (C) Eléctrico(D) Atlético CP (E) Estrela (F) Lusitânia (Azores) |
See main article: 2005–06 Primeira Liga.
These teams were promoted from the Liga de Honra at the start of the season:
These teams were qualified for the UEFA competitions of 2006-07:
These teams were relegated to the League of Honour at the end of the season:
The SuperLiga will be reduced from 18 to 16 teams for 2006–07. To accommodate this, four teams were relegated from the SuperLiga, with only two promoted from the Liga da Honra.
UEFA Champions League third qualifying round
| 1st leg | 10 August 2005 | Sporting CP 0–1 Udinese | |
| 2nd leg | 23 August 2005 | Udinese 3–2 Sporting CP |
UEFA Cup first round
| 1st leg | 15 September 2005 | Halmstad BK 1–2 Sporting Clube de Portugal | |
| 2nd leg | 29 September 2005 | Sporting CP 2–3 Halmstad BK (a.e.t.) |
UEFA Champions League group H
| Match One | 13 September 2005 | Rangers 3–2 Porto | |
| Match Two | 28 September 2005 | Porto 2–3 Artmedia Bratislava | |
| Match Three | 19 October 2005 | Porto 2–0 Internazionale | |
| Match Four | 1 November 2005 | Internazionale 2–1 Porto | |
| Match Five | 23 November 2005 | Porto 1–1 Rangers | |
| Match Six | 6 December 2005 | Artmedia Bratislava 0–0 Porto |
UEFA Champions League group D
| Match One | 14 September 2005 | Benfica 1–0 Lille | |
| Match Two | 27 September 2005 | Manchester United 2–1 Benfica | |
| Match Three | 18 October 2005 | Villarreal 1–1 Benfica | |
| Match Four | 2 November 2005 | Benfica 0–1 Villarreal | |
| Match Five | 22 November 2005 | Lille 0–0 Benfica | |
| Match Six | 7 December 2005 | Benfica 2–1 Manchester United |
UEFA Champions League first knockout round
| 1st leg | 21 February 2006 | Benfica 1–0 Liverpool | |
| 2nd leg | 8 March 2006 | Liverpool 0–2 Benfica |
UEFA Champions League quarter-finals
| 1st leg | 28 March 2006 | Benfica 0–0 Barcelona | |
| 2nd leg | 5 April 2006 | Barcelona 2–0 Benfica |
UEFA Cup first round
| 1st leg | 15 September 2005 | Red Star Belgrade 0–0 Braga | |
| 2nd leg | 29 September 2005 | Braga 1–1 Red Star Belgrade |
UEFA Cup first round
| 1st leg | 15 September 2005 | Vitória de Setúbal 1–1 Sampdoria | |
| 2nd leg | 29 September 2005 | Sampdoria 1–0 Vitória de Setúbal |
UEFA Cup first round
| 1st leg | 15 September 2005 | Vitória de Guimarães 3–0 Wisła Kraków | |
| 2nd leg | 29 September 2005 | Wisła Kraków 0–1 Vitória de Guimarães |
UEFA Cup group H
| Match One | 20 October 2005 | Zenit Saint Petersburg 2–1 Vitória de Guimarães | |
| Match Three | 24 November 2005 | Vitória de Guimarães 1–1 Bolton Wanderers | |
| Match Four | 1 December 2005 | Sevilla 3–1 Vitória de Guimarães | |
| Match Five | 14 December 2005 | Vitória de Guimarães 1–3 Beşiktaş |
Porto won their 17th Portuguese Cup after beating Vitória de Setúbal) 1–0 on 14 May 2006.
See main article: 2005–06 Liga de Honra.
These teams were relegated from the Primeira Liga at the start of the season:
These teams were promoted from the Portuguese Second Division B at the start of the season:
These teams were promoted to the Liga betandwin.com at the end of the season:
These teams were relegated to the Second Division at the end of the season:
Only players with at least 10 goals
| Place | Scorer | Goals | Team |
|---|---|---|---|
| 1. |  Cássio | 20 | Maia/Chaves |
 Nuno Sousa | Gondomar | ||
| 3. | Bock | 19 | Vizela |
| 4. |  Fumo | 14 | Gondomar |
| 5. | Cícero | 13 | Varzim |
| Roma | Beira-Mar | ||
| 7. | Nei | 12 | Moreirense |
| Djalmir | Feirense | ||
| 9. | Ricardo Silva | 11 | Olhanense |
| 10. | Basílio Almeida | 10 | Santa Clara |
| Brasília | Leixões |
See main article: 2005–06 Segunda Divisão.
The organization of the Second Division was changed for the 2005-06 season. The name was changed from Second Division B to Second Division, and the Northern, Central and Southern zones were abolished to be replaced by another geographical scheme with 4 alphabetically named series.
Only one team was relegated from the League of Honour at the start of the season:
16th placed Gondomar and 17th placed Chaves that would normally be relegated to the Second Division, were allowed to play again in the League of Honour, since 11th placed Felgueiras and 13th placed Alverca closed their football sections.
These teams were promoted from the Terceira Divisão at the start of the season:
At the end of the 2004-05 season, the winner of the Third Division Serie Azores had to a playoff with the worst placed Azorean team in the Second Division B Southern Zone. 13th placed SC Lusitânia lost the first leg 1-2 to Serie Azores champions FC Madalena, but won the second leg 1-0. Because the Portuguese system doesn't apply the away goal rule, the teams went to penalties, in which Madalena won 5-4.
Meanwhile, Académico de Viseu, that was scheduled to play in the 2005-06 season in the Second Division Series C, decided to quit early in the season, and was accordingly relegated to the district championships. Another entrance in the division was the reserve team Vitória FC "de Setúbal" B.
According to the Portuguese Football Federation, only two teams will be promoted to the League of Honour at the end of the season. The champions of Series A will play their Series B counterparts in a playoff, and the same will happen for the champions of Series D and C. The winners will be promoted to the League of Honour.
Also according to the Federation, the last 4 of every Series will be relegated to the Third Division. And, if a reserve "B" team is relegated or quits, another additional team will be relegated to the Third Division.
| Date | Venue | Opponents | Score | Comp | Portugal scorers | |
|---|---|---|---|---|---|---|
| August 17, 2005 | Estádio de São Miguel, Ponta Delgada | Egypt | 2–0 | F | Fernando Meira, Hélder Postiga | |
| September 3, 2005 | Estádio Algarve, Faro-Loulé | Luxembourg | 6–0 | WCQ3 | Jorge Andrade, Ricardo Carvalho, Pauleta (2), Simão (2) | |
| September 7, 2005 | Lokomotiv Stadium, Moscow | Russia | 0–0 | WCQ3 | - | |
| October 8, 2005 | Estádio Municipal de Aveiro, Aveiro | Liechtenstein | 2–1 | WCQ3 | Pauleta, Nuno Gomes | |
| October 10, 2005 | Estádio do Dragão, Porto | Latvia | 3–0 | WCQ3 | Pauleta (2), Hugo Viana | |
| November 12, 2005 | Estádio Cidade de Coimbra, Coimbra | Croatia | 2–0 | F | Petit, Pauleta | |
| November 15, 2005 | Windsor Park, Belfast | Northern Ireland | 1–1 | F | Own goal | |
| March 1, 2006 | LTU arena, Düsseldorf | Saudi Arabia | 3–0 | F | Cristiano Ronaldo (2), Maniche |
KEY: WCQ3 = World Cup Qualification match - Group 3; F = Friendly