2009–10 Liga III

The 2009–10 Liga III season was the 54th season of Liga III, the third tier of the Romanian football league system. The season started on August 21, 2009 and ended on June 4, 2010.

The winners of each division got promoted to the 2010–11 Liga II season.

The bottom six from each division were relegated at the end of the season to the county football leagues (Liga IV). From the 12th placed teams, another one was relegated. To determine this team, separate standings were computed, using only the games played against the clubs ranked 1st through 11th.

To Liga III
Relegated from Liga II
 * Liberty Salonta**
 * Buftea**
 * Știința Bacău
 * ACU Arad
 * Progresul București
 * Prefab Modelu
 * FCM Târgoviște
 * Forex Brașov
 * Mechel Câmpia Turzii

From Liga III
Promoted to Liga II
 * Râmnicu Sărat
 * Steaua București II
 * Victoria Brănești
 * Gaz Metan CFR Craiova
 * Fortuna Covaci
 * Baia Mare
 * Tricolorul Breaza
 * Silvania Șimleu Silvaniei
 * Săgeata Stejaru**

Note (**)
CS Buftea sold its Liga II place to third tier club Săgeata Stejaru.

Liberty Salonta withdrew at the end of the season from Liga II, CFR Timișoara, which initially relegated, was spared from relegation.