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 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.

League standings

Group I - Galicia

Group II - Asturias

Group III - Cantabria

Group IV - Basque Country

Group V - Catalonia

Group VI - Valencian Community

Group VII - Community of Madrid

Group VIII - Castilla and León

Group IX - Eastern Andalusia and Melilla

Group X - Western Andalusia and Ceuta

Group XI - Balearic Islands

Group XII - Canary Islands

Group XIII - Region of Murcia

Group XIV - Extremadura

Group XV - Navarra

Group XVI - La Rioja

Group XVII - Aragón

Group XVIII - Castilla-La Mancha

Promotion play-offs

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.