The Premier League side beat Palmeiras 2-1 in Abu Dhabi to win the Club World Cup, thanks to Kai Havertz' extra time penalty after the match finished 1-1 after 90 minutes.
Having lost to Corinthians in 2012, the Blues went one better here.
Covid-stricken manager Thomas Tuchel recovered and made it to the Middle East in time for his side's historic win, marking a huge achievement for a number of individuals, including the billionaire owner.
Roman Abramovich was in attendance to see the club he purchased in 2003 named champions of the world, completing a clean sweep for the Russian businessman.
Chelsea have now lifted every trophy possible under Abramovich's tenure, collecting their 21st bit of silverware since 2003 - eight more than the club had won in their history prior to their blockbuster takeover.
That trophy haul is also more than any other English side since 2003, despite peak years at Manchester United and Arsenal under legendary managers Sir Alex Ferguson and Arsene Wenger.
Much of Abrahmovich's success has been attributed to his incredible managerial turnover, but current boss Tuchel has shown just how highly he should now be regarded by the club.
Taking over from Frank Lampard a little more than a year ago on January 26 2021, Tuchel has picked up his third trophy at the club following Champions League and Super Cup crowns.
That success lifts the German to second place in terms of the most honoured coaches of the Abramovich era, level with Carlo Ancelotti, and only behind Jose Mourinho's eight trophies.
The win in Abu Dhabi also cemented legendary status for a number of Chelsea stars, including club captain Cesar Azpilicueta, who, despite links away from Stamford Bridge, has now collected nine trophies in an iconic decade with the club. The defender has now won the lot.
Someone who's been with the team for far less time but picking up honours at just as impressive a rate is returning goalkeeper Edouard Mendy.
Brought in as a last-minute solution to Chelsea's issue with then £73million club record signing Kepa Arrizabalaga, the shot-stopper has come back from securing Senegal's first ever African Cup of Nations win to collect his fourth trophy since joining Chelsea.
Fan-favourite N'Golo Kante has also joined an exclusive list of just four players to win the Premier League, World Cup, Champions League and Club World Cup. That elite lists also includes Arsenal hero Thierry Henry and Spain and Barcelona legends Pedro and Gerard Pique.
Havertz, meanwhile, became the first player to score match-winners in the latter two competitions since Lionel Messi in 2011.
And another man who has won his place in Chelsea fan's hearts forever is 37-year-old Thiago Silva, who becomes only the second defender to be named man of the match in a Club World Cup final after Sergio Ramos.