|3||FC Porto||34||73||23||4||7||67||30||+37 4|
|6||Rio Ave||34||50||14||8||12||44||44||+0 1|
|17||U. Madeira||34||29||7||8||19||27||50||-23 1|
The Primeira Liga (Portuguese: [pɾiˈmɐjɾɐ ˈliɣɐ]; English: First League), also known as Liga NOS for sponsorship reasons, is the top professional association football division of the Portuguese football league system. It is organised and supervised by the Liga Portuguesa de Futebol Profissional. As of the 2014–15 season, the Primeira Liga is contested by 18 teams, with the two lowest placed teams relegated to the Segunda Liga and replaced by the top-two non-reserve teams from this division.
Founded in 1934 as an experimental league, it was officialised in 1938 and named Primeira Divisão (First Division) until 1999, when it recovered the original naming. A total of 70 teams have competed in the Primeira Liga, but only five have been crowned champions. Among them, the "Big Three" – Benfica (34), Porto (27) and Sporting CP (18) – have won all but two Primeira Liga titles; the other winners are Belenenses (1945–46) and Boavista (2000–01). Benfica have won the Primeira Liga a record 34 times, followed by Porto with 27 and Sporting CP with 18 wins.
The Primeira Liga has increased its reputation in the last few years, occupying the 5th place of UEFA's league ranking. It broke into the top five for the first time in the 2011–12 season, passing the French Ligue 1, one of the historical "big five" European leagues, for the first time since 1990. The Primeira Liga also reached a world ranking of 4th according to IFFHS's 2011 ranking.