The 2009–10 season was ACF Fiorentina's 84th season in Italian football in their existence and their 72nd season in the first-tier of Italian football, Serie A.

Having finished fourth the previous season ahead of Genoa, La Viola earned qualification into the UEFA Champions League for the second year in a row.

Last updated: 1 June 2010 Total spending: €34.7 million + Manuel da Costa

Last updated: 30 April 2010 Total income: ~€40 million

Source: Competitive matches