The 2012–13 Segunda División de Futsal season is the 20th season of second-tier futsal in Spain since its inception in 1993.
Regular season started in October 2012 and finished on April 27, 2013.
Top team at standings when finishing to play the regular season is promoted to Primera División while teams that finished between 2nd–6th positions play the promotion playoffs.
On 3 May, LNFS announced the cancellation of promotion playoffs due to Primera División's expansion to 16 teams, so Castell Peñíscola Benicarló and Fuconsa Jaén were promoted to Primera División.
[1] Promotion playoffs were cancelled.