ACF Fiorentina, commonly referred to as Fiorentina, is an Italian professional football club based in Florence, Tuscany. The original team was founded by a merger in August 1926, while the current club was refounded in August 2002 following bankruptcy. Fiorentina have played at the top level of Italian football for the majority of their existence; only four clubs have played in more Serie A seasons.

The Serie A, officially known as Serie A TIM for sponsorship reasons, is a professional league competition for football clubs located at the top of the Italian football league system. The winners are awarded the Coppa Campioni d'Italia trophy and the scudetto, a decoration that they wear on the jersey the season after the victory. It has been operating as a round-robin tournament for over ninety years since the 1929–30 season. It had been organized by the Direttorio Divisioni Superiori until 1943, the Lega Calcio until 2010, and the Lega Serie A ever since. Serie A is regarded as one of the best football leagues in the world and it is often depicted as the most tactical and defensively sound national league. Serie A was the world's strongest national league in 2020 according to IFFHS, and is ranked second among European leagues according to UEFA's league coefficient – behind the Premier League, and ahead of La Liga, Bundesliga and Ligue 1 – which is based on the performance of Italian clubs in the Champions League and the Europa League during the previous five years. Serie A led the UEFA ranking from 1986 to 1988 and from 1990 to 1999.