Secret Story 2009 is the third edition of the French reality show Secret Story. It began airing on TF1 on June 19, 2009 and continue to air until September 25, 2009, lasting 99 days, and is presented by Benjamin Castaldi, who presented Loft Story and the first two seasons of Secret Story.

Secret Story is a French reality competition television show. Despite not being a direct adaptation of the Big Brother franchise's format, created by producer John de Mol in 1997, the show has a similar concept while including his own game mechanics, and is also produced and owned by Endemol Shine Group/Banijay.