The Campeonato Nacional de Liga de Primera División, commonly known as the Primera División or LaLiga, 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. It is controlled by the Liga Nacional de Fútbol Profesional and is contested by 20 teams over a 38-matchday period.

Since its inception, 62 teams have competed in La Liga, with nine teams crowned champions. Real Madrid and Barcelona have dominated the competition, winning 36 and 28 titles respectively. In the 1940s, Valencia, Atlético Madrid, and Barcelona emerged as the strongest clubs. Real Madrid and Barcelona led the charge in the 1950s, each winning four titles. During the 1960s and 1970s, Real Madrid dominated with fourteen titles, with Atlético Madrid winning four. During the 1980s and 1990s, Real Madrid remained prominent, while the Basque clubs of Athletic Bilbao and Real Sociedad enjoyed success, each winning two titles. From the 1990s onward, Barcelona have been the most successful club, winning seventeen titles, with Real Madrid close behind. La Liga has seen other champions, including Valencia and Deportivo La Coruña.

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 the English Premier League and Italian Serie A. La Liga has led the coefficient rankings for more years than any league, and has also produced the continent's top-rated club more times than any other league overall. La Liga clubs have won the most UEFA Champions League (20), UEFA Europa League (14), UEFA Super Cup (16) and FIFA Club World Cup (8) titles, and its players have accumulated the highest number of 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 most popular professional sports leagues globally, 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 in the world and the third-highest of any professional association football league in the world, behind fellow Big Five leagues the Premier League and the Bundesliga. La Liga is also the seventh wealthiest professional sports league in the world by revenue, after the NFL, MLB, the NBA, the Premier League, the NHL, and the Bundesliga.

From 2008 to 2016, it was sponsored by Banco Bilbao Vizcaya Argentaria and known as Liga BBVA. Then, from 2016 to 2023, it was sponsored by Banco Santander and known as LaLiga Santander. Since 2023, it has been sponsored by Electronic Arts and is known as LaLiga EA Sports.

The competition format follows the usual double round-robin format. During the course of a season, which lasts from August to May, each club plays every other club twice, once at home and once away, for 38 matches. Teams receive three points for a win, one point for a draw, and no points for a loss. Teams are ranked by total points, with the highest-ranked club crowned champion at the end of the season.

A system of promotion and relegation exists between the Primera División and the Segunda División. The three lowest placed teams in La Liga are relegated to the Segunda División, and the top two teams from the Segunda División promoted to La Liga, with an additional club promoted after a series of play-offs involving the third, fourth, fifth and sixth placed clubs. Below is a complete record of how many teams played in each season throughout the league's history;

If points are equal between two or more clubs, the rules are: