The 2012–13 Lega Basket Serie A was the 91st season of the Lega Basket Serie A, the top level basketball league in Italy.

The season started 26 September 2012 and ended on 19 June 2013.

[1] Montepaschi Siena initially won the championship.

However, their championship was revoked in 2016 after investigations exposed financial and fiscal fraud.