The 2015–16 División de Honor B, the XVIII edition since its inception in 1998, began on September 19, 2015 with the first matchday of regular season and will run through 29 May with the Promotion playoffs Final.

For 2015–16 season, championship comprises 3 groups of 12 teams each.

The regular season runs through 22 matchdays.

Upon completion the regular season, the two top teams of each group and two-best 3rd placed teams qualify for promotion playoff.

To determine pairings, teams qualified are sorted by total points.