The Campeonato Nacional de Liga de Primera División, commonly known as the Primera División or La Liga, and officially known as LaLiga EA Sports for sponsorship reasons, is a professional association football league in Spain and the highest level of the Spanish football league system. Governed by the Liga Nacional de Fútbol Profesional, it is contested by 20 teams over 38 matchdays.

A total of 63 teams have competed in La Liga since its inception. Nine clubs have been crowned Spanish champions. Real Madrid and Barcelona have dominated the competition, with 36 and 29 titles respectively. Other successful clubs include Valencia, Atlético Madrid, Athletic Bilbao, and Real Sociedad, while Deportivo La Coruña have also won the title, reflecting a history of success across several Spanish clubs.

As of the 2024–25 season, La Liga is ranked third in the UEFA coefficient rankings based on performances in European competitions over the past five seasons, behind England's Premier League and Italy's Serie A. La Liga has led the coefficient rankings for more years than any other league and has produced the continent's top-rated club more often than any other league. Its clubs have won more UEFA Champions League (20), UEFA Europa League (14), UEFA Super Cup (17) and FIFA Club World Cup (8) titles than those of any other league, while its players have accumulated the most Ballon d'Or awards (24), The Best FIFA Men's Player awards (19) and UEFA Men's Player of the Year awards (12).

La Liga is one of the world's most popular professional sports leagues, with an average attendance of 26,933 for league matches in the 2018–19 season. This is the eighth-highest of any domestic professional sports league and the third-highest of any professional association football league, behind the Premier League and the Bundesliga. By revenue, La Liga ranks seventh among professional sports leagues worldwide, behind the NFL, MLB, the NBA, the Premier League, the NHL and the Bundesliga.