It began on 30 August 2008 and ended on 31 May 2009, with the announcement of the list of fixtures made on 25 July 2008.
20 teams competed in the league, 17 of which returned from the previous season, and three (Chievo, Bologna and Lecce) were promoted from 2007–08 Serie B.
On 16 May 2009, Internazionale won the league by holding an unassailable lead after A.C. Milan's loss away to Udinese.
The 2008–09 season saw new rules relating to the transfer of player registration introduced.
^1 Juventus youth sector chief Ciro Ferrara was originally appointed on a temporary basis for the two final weeks of the season.