Empoli secured a 4-0 win over Cosenza and the Tuscan side are officially back in Serie A after two seasons.
The three points over Cosenza on Tuesday means Empoli have secured promotion with two games left to play in Serie B, having dominated the championship.
The Azzurri are out of reach for Monza, Salernitana and Lecce, and thus return to the top flight after only two years in Serie B.
The great architect of the promotion was the young coach Alessio Dionisi and Empoli are promoted for the fifth time in the last 20 years with 18 wins, 16 draws and only two defeats this term.
The leaders also have the best attack and the best defence at the second tier.