The 2011–12 Primeira Liga (also known as Liga ZON Sagres for sponsorship reasons) was the 78th season of the Primeira Liga, the top professional league for Portuguese association football clubs. It began on 14 August 2011 and ended on 13 May 2012. A total of 16 teams contested the league, 14 of which already took part in the previous season and two of which were promoted from the Liga de Honra. Porto were the defending champions and secured their 26th and second consecutive league title. Óscar Cardozo and Lima, respectively Benfica's and Braga's strikers, were the joint top scorers with 20 goals.
A total of 16 teams will contest the league, 14 of which already contested in the 2010–11 season and two of which were promoted from the 2010–11 Liga de Honra. The two teams relegated following the 2010–11 season were Portimonense, who return to the Liga de Honra just a year after promotion, and Naval, returning to the second tier after a six-year stay. Replacing them in the top flight are Liga de Honra champions Gil Vicente, competing in their fourteenth Liga season after returning from a five-year absence, and Feirense, who are in the premier division for the fourth time, and the first since the 1989–90 season.
Updated to games played on 12 May 2012.
Rules for classification: 1st points; 2nd head-to-head points; 3rd head-to-head away goal difference; 4th head-to-head goals scored; 5th goal difference; 6th number of matches won; 7th number of goals scored 1Académica qualify to the group stage of the 2012–13 UEFA Europa League as winner of the 2011–12 Taça de Portugal. (C) = Champion; (R) = Relegated; (P) = Promoted; (E) = Eliminated; (O) = Play-off winner; (A) = Advances to a further round.
Only applicable when the season is not finished: (Q) = Qualified to the phase of tournament indicated; (TQ) = Qualified to tournament, but not yet to the particular phase indicated; (RQ) = Qualified to the relegation tournament indicated; (DQ) = Disqualified from tournament.