The rivalry between Chelsea and Leeds United is a football rivalry between London-based club Chelsea and Yorkshire-based Leeds United. The rivalry first emerged in the 1960s after a series of fiercely contested and controversial matches, when the two clubs were frequently involved in the pursuit of domestic and European honours culminating in the 1970 FA Cup final, which is regarded as one of the most physical matches in English football history.

Chelsea Football Club is an English professional football club based in Fulham, West London. Founded in 1905, the team play their home games at Stamford Bridge. The club competes in the Premier League, the top division of English football. It won its first major honour, the League championship, in 1955. The club won the FA Cup for the first time in 1970, their first European honour, the Cup Winners' Cup, in 1971, and became the third English club to win the Club World Cup in 2022.