The 2004–05 Lega Basket Serie A season, known as the Serie A TIM for sponsorship reasons, was the 83rd season of the Lega Basket Serie A, the highest professional basketball league in Italy. The regular season ran from October 3, 2004 to May 2005, 18 teams played 34 games each. The top 8 teams made the play-offs whilst the lowest ranked team, Sicc Cucine Jesi and the bankrupt club Scavolini Pesaro, were relegated to the Legadue. Climamio Bologna won their second title by winning the playoff finals series against Armani Jeans Milano.