Cremonese were promoted to Serie A after a two-year absence, following a 3–2 victory at Spezia in the second leg of their playoff final on Sunday.
After the first game ended goalless on Thursday, the second match turned into a thriller as a double from Manuel De Luca and a goal from Michele Collocolo gave Cremonese a three-goal lead.
Spezia rallied with two late goals but could not overcome the deficit and will remain in Serie B for the next season.
The Lombardy club Cremonese, relegated in 2023, will now join Pisa and Sassuolo in returning to Italian top flight, taking the places of Empoli, Venezia and Monza, who were relegated at the end of the season.
"This season will be remembered for all we achieved: with sheer determination and plenty of drive, we secured promotion," Cremonese manager Giovanni Stroppa told DAZN.