2009–10 Tercera División

The 2009–10 Tercera División was the fourth tier of football in Spain. Play started on 29 August 2009 and ended on 20 June 2010 with the promotion play-off finals.

Overview
There were 362 clubs competing in Tercera División (Third division) in the 2009–10 season, divided into 18 regional groups, accommodating between 20 and 22 clubs.

The following clubs finished as champions of their respective groups


 * Grupo I (Galicia) - Deportivo B
 * Grupo II (Asturias) - Caudal
 * Grupo III (Cantabria) - Noja
 * Grupo IV (País Vasco) - Real Sociedad B
 * Grupo V (Cataluña) - L'Hospitalet
 * Grupo VI (Comunidad Valenciana) - Gandía
 * Grupo VII (Comunidad de Madrid) - Rayo B
 * Grupo VIII (Castilla & León) - Burgos
 * Grupo IX (Andalucía Oriental (Almería, Granada, Jaén & Málaga) & Melilla) - At. Mancha Real
 * Grupo X (Andalucía Occidental (Cádiz, Córdoba, Huelva & Sevilla) & Ceuta) - Alcalá
 * Grupo XI (Islas Baleares) - Atlético Baleares
 * Grupo XII (Canarias) - Corralejo
 * Grupo XIII (Región de Murcia) - Jumilla
 * Grupo XIV (Extremadura) - Badajoz
 * Grupo XV (Navarra) - Tudelano
 * Grupo XVI (La Rioja) - Oyonesa
 * Grupo XVII (Aragón) - Teruel
 * Grupo XVIII (Castilla-La Mancha) - La Roda

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.

Group winners promotion play-off
Promoted to Segunda División B: Deportivo B, Gandía, Atlético Baleares, Alcalá, Real Sociedad B, Teruel, Badajoz, Caudal and Rayo B.

Non-champions promotion play-off
Promoted to Segunda División B: Getafe B, Yeclano, Coruxo, Santboià, La Muela, Alzira, Peña Sport, Extremadura and L'Hospitalet.