The 2009–10 Lega Pro Seconda Divisione season will be the thirty-second football league season of ItalianLega Pro Seconda Divisione since its establishment in 1978, and the second since the renaming from Serie C to Lega Pro. It will be divided into two phases: the regular season, played from September 2009 to May 2010, and the playoff phase from May to June 2010. The league will also be composed of 54 teams divided into three divisions of 18 teams each, whose teams will be divided geographically. Teams will play only other teams in their own division, once at home and once away for a total of 34 matches each. Teams finishing first in the regular season, plus one team winning the playoff round from each division will be promoted to Lega Pro Prima Divisione; teams finishing last in the regular season, plus two relegation playoff losers from each division will be relegated to Serie D. In all, six teams will be promoted to Prima Divisione, and nine teams will be relegated to Serie D.
On July 9, the Covisoc organization announced that 11 Seconda Divisione clubs did not pass the financial requirements in order to be admitted to the league. The clubs were allowed to appeal the decision until July 11. Seven were eventually saved. Of the remaining four, two did not bother to file submissions even before the review started, one did not appeal Covisoc's decision, while the fourth team lost on appeal. The league was to feature six teams relegated from 2008–09 Lega Pro Prima Divisione: Pro Sesto, Sambenedettese, Legnano, Pistoiese, Juve Stabia, and Potenza. Three vacancies were created from this group. Two teams were excluded from the 2009–10 season as they did not pass the financial requirements: Sambenedettese did not appeal the commission's decision, while Pistoiese lost on appeal. On July 30, Potenza was called up to Prima Divisione to fill a vacancy. It was to feature nine teams promoted from 2008–09 Serie D as division winners: Biellese - Girone A, P.B. Vercelli - Girone B, Sacilese - Girone C, Crociati Noceto - Girone D, Sporting Lucchese - Girone E, Pro Vasto - Girone F, Villacidrese - Girone G, Brindisi - Girone H, and Siracusa - Girone I. The remaining 39 teams were to come from the group of teams that played in 2008–09 Lega Pro Seconda Divisione that were neither relegated nor promoted. Another four vacancies were created from this group. Ivrea failed to register for the upcoming season. Alessandria - 2nd in Girone A, Andria - 5th in Girone C, and Viareggio - 2nd in Girone B - all promotional playoff losers in the Second Divisione 2008–09 season were called up to Prima Divisione anyway to fill vacancies. The eight vacancies were successively filled as follows:
Spezia - 2nd in 2008–09 Serie D - Girone A, replacing first place Biellese
Nocerina - 2nd in 2008–09 Serie D - Girone H, winner of the playoffs
Vico Equense - 2nd in 2008–09 Serie D - Girone I, finalist in the playoffs
Fano - 2nd in 2008–09 Serie D - Girone F, selected by the league
FeralpiSalò - 4th in 2008–09 Serie D - Girone D, selected by the league
Valenzana - 16th in 2008–09 Lega Pro Seconda Divisione - Girone A, originally relegated for losing in the playouts.
Poggibonsi - 15th in 2008–09 Lega Pro Seconda Divisione - Girone B, originally relegated for losing in the playouts.
Isola Liri - 17th in 2008–09 Lega Pro Seconda Divisione - Girone C, originally relegated for losing in the playouts.
Teams
Girone A
Girone B
Girone C
League table
Girone A
Girone B
Girone C
Promotion Playoffs
Girone A
Spezia promoted to Lega Pro Prima Divisione.
Girone B
Gubbio promoted to Lega Pro Prima Divisione.
Girone C
hc - higher classified team wins Cisco Roma promoted to Lega Pro Prima Divisione.
Relegation Playoffs
Girone A
P.B. Vercelli and Carpenedolo relegated to Serie D.
Girone B
Colligiana and Bellaria Igea relegated to Serie D.