The Lega Nazionale Professionisti B (Italian for National Professionals League B), commonly known as LNPB or Lega B[1] (B League), is the governing body that runs the second tier of professional football competitions in Italy, the Serie B.

[3] Since April 2011, Lega Serie B has joined the European Professional Football Leagues association.

During the course of a season (generally from August to May) each club plays the others twice (a double round robin system), once at their home stadium and once at that of their opponents, for a total of 38 games.

However, if following the application of the above-mentioned tiebreaker criteria there is still a tie for the championship, for relegation, or for qualification to the play–offs, positions will be decided by drawing of lots.

At the lower end of the table, the three bottom clubs, along with the loser of play-offs involving the 16th and 17th placed teams, are relegated to the Serie C, with four sides from said league joining Serie B in their place.