| Prevseason: | 2011–12 |
| Nextseason: | 2013–14 |
| Lega Basket Serie A | |
| Season: | 2012–13 |
| Champions: | |
| Runners Up: | Acea Roma |
| Relegated: | Angelico Biella |
| Teams: | 16 |
| Dates: | 26 September 2012 – 19 June 2013 |
| Top Seed: | Cimberio Varese |
| Mvp Link: | Lega Basket Serie A MVP |
| Mvp N: | ITA |
| Finals Mvp Link: | Lega Basket Serie A Finals MVP |
| Finals Mvp N: | ITA |
| Ppg: | 18.6 |
| Ppg N: | USA |
| Rpg: | 8.4 |
| Rpg N: | NGR |
| Apg: | 7.1 |
| Apg N: | USA |
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 However, their championship was revoked in 2016 after investigations exposed financial and fiscal fraud.
| width=20 |
| width=200 | Teams ! | width=20 | P ! | width=20 | W ! | width=20 | L ! | width=35 | PF ! | width=35 | PA ! | Qualification or relegation |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 30 | 23 | 7 | 2519 | 2311 | Playoffs | ||||||||
| 2 | 30 | 22 | 8 | 2677 | 2513 | |||||||||
| 3 | 30 | 20 | 10 | 2361 | 2273 | |||||||||
| 4 | 30 | 19 | 11 | 2441 | 2304 | |||||||||
| 5 | 30 | 18 | 12 | 2309 | 2160 | |||||||||
| 6 | 30 | 18 | 12 | 2328 | 2201 | |||||||||
| 7 | 30 | 17 | 13 | 2222 | 2051 | |||||||||
| 8 | 30 | 16 | 14 | 2370 | 2354 | |||||||||
| 9 | 30 | 13 | 17 | 2164 | 2310 | |||||||||
| 10 | 30 | 13 | 17 | 2294 | 2431 | |||||||||
| 11 | 30 | 13 | 17 | 2397 | 2413 | |||||||||
| 12 | 30 | 11 | 19 | 2441 | 2483 | |||||||||
| 13 | 30 | 11 | 19 | 2489 | 2570 | |||||||||
| 14 | 30 | 10 | 20 | 2249 | 2405 | |||||||||
| 15 | 30 | 10 | 20 | 2245 | 2383 | |||||||||
| 16 | 30 | 6 | 24 | 2168 | 2512 | Relegation to Lega Due |