2009–10 Lega Basket Serie A

Montepaschi Siena won their 5th title by winning the playoff finals series against Armani Jeans Milano.

The participating 16 teams disputed the regular season based on home-and-away matches.

The top eight teams at the halfway point of the regular season (15 rounds) competed in the Italian Cup, seeded according to their league placement at that time.

The cup was won by top seed Montepaschi Siena, for second year in a row (and second time ever).

The Italian Supercup was played as a single match before the start of the season between the previous year's Serie A champion and Coppa Italia winner (if a club wins both, the match instead pits the top two teams from the previous season's league).

Geographical distribution of Serie A maschile FIP 2009–2010 teams