The 2004–05 season was Chelsea F.C.'s 90th competitive season, 13th consecutive season in the Premier League and 99th year as a club. Managed by José Mourinho during his first season at the club, Chelsea won the Premier League title (their first league title in 50 years) and the League Cup. The season was historic for the vast number of of records set during the season. The list of achievements include; most away wins in a season (15), most clean sheets kept in a season (25), fewest goals conceded away in a season (9), most wins in a season (29), most consecutive away wins (9), fewest goals conceded in a season (15) and most points in a season (95).

After missing out on the league title to the unbeaten Arsenal in the previous season, Chelsea continued spending large sums of money in order to build a squad capable of challenging for honours. They were in their second season under the ownership of Roman Abramovich, enabling them to sign five players for more than £10 million each, including Ivorian striker Didier Drogba from Marseille and defender Ricardo Carvalho from Mourinho's former club, Porto. Portuguese defender Paulo Ferreira also followed Mourinho to Chelsea from Porto.

In the Champions League, Chelsea aimed to improve upon their semi-final placing the previous year, but in the end only matched their achievement. They also exited the FA Cup in the fifth round to eventual semi-finalists Newcastle United.

The team kit was produced by Umbro. The shirt sponsor was Emirates Airline; the kit bore the "Fly Emirates" logo. Chelsea's home kit, all blue with a white collar, was retained from the previous season. Their new away kit was black with grey shorts and accents. Chelsea retained last season's away kit (all white with black and blue stripes down the center) as the third kit for this season.

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