The 2011–12 Lega Basket Serie A was the 90th season of the Lega Basket Serie A, the top level basketball league in Italy.

The season started on 9 October 2011 and ended on 6 May 2012.

[1] Montepaschi Siena initially won the national title.

However, in 2016 their championship was revoked after investigations showed financial and fiscal fraud.