The 2012–13Tercera División was the fourth tier of football in Spain. Play started on 24 August 2012 and the season ended on 30 June 2013 with the promotion play-off finals.
Overview
There were 359 clubs competing in Tercera División (Third division) in the 2012–13 season, divided into 18 regional groups, accommodating between 18 and 21 clubs.
The following clubs finished as champions of their respective groups
The 18 group champion clubs participated in the Group winners promotion play-off and the losers from these 9 play-off ties then proceeded to the Non-champions promotion play-off with clubs finishing second third and fourth.
^Due to Salamanca relegation from Segunda División B to this group, the reserve team, Salamanca B, was forced to relegate to Primera Regional. Salamanca was liquidated due to the accumulation of unpaid debts.