The 2009–10 Premier League was the 18th season of the Premier League since its establishment in 1992. A total of 20 teams competed in the league, with Chelsea unseating the three-time defending champions Manchester United, scoring a then Premier League record 103 goals in the process. The season began on 15 August 2009 and concluded on 9 May 2010. Prior to each opening week match, a minute's applause was held in memory of Sir Bobby Robson. Nike provided a new match ball – the T90 Ascente – for this season. Barclays sponsored the league.

The Premier League is the highest level of the English football league system. Contested by 20 clubs, it operates on a system of promotion and relegation with the English Football League (EFL). Seasons usually run from August to May, with each team playing 38 matches: two against each other, one home, and one away. Most games are played on Saturday and Sunday afternoons, with occasional weekday evening fixtures.