13.05.1912
foundation as Unione Ginnico Sportiva Grossetana
__.05.1927
merger with CS Grossetano and renaming to Unione Sportiva Grosseto
__.__.1995
dissolution due to financial problems
__.__.1995
new foundation as Unione Sportiva Grosseto Football Club 1912
__.__.2000
renaming to Unione Sportiva Grosseto Football Club
__.__.2015
dissolution due to financial problems
31.07.2015
new foundation as Football Club Grosseto Società Sportiva Dilettantistica
__.__.2017
dissolution due to financial problems
18.07.2017
new foundation as Associazione Sportiva Dilettantistica Unione Sportiva Grosseto 1912 on basis of AC Roselle
__.07.2019
renaming to Società Sportiva Dilettantistica Unione Sportiva Grosseto 1912
__.__.2020
renaming to Unione Sportiva Grosseto 1912