2009–10 Rugby Pro D2 season

This season also welcomed Lannemezan and Aix-en-Provence, respectively Fédérale 1 champions and runners-up, who took the place of Bourg-en-Bresse and Béziers, the previous year's two bottom finishers.

La Rochelle, despite having lost both confrontations against Lyon during the regular season, triumphed 32–26 and earned the right to accompany Agen in the Top 14 after eight years spent in Pro D2.

[1] Their decision not to appeal the DNACG's ruling also meant that Aix would be reprieved and compete again in Pro D2 for the next year.

They were eventually followed by Albi, who defeated Oyonnax in the final of the promotion playoffs to secure a spot in the 2009–10 Top 14.

Lannemezan and Aix-en-Provence earned promotion from Fédérale 1 for the 2009–10 season, while Dax and Mont-de-Marsan were relegated from the 2008–09 Top 14.