Petit Best 9 (プッチベスト9) is the 9th best album in the Petit Best series, which are annual compilations released at the end of the year that feature best hits from the artists of Hello! Project during that year, with an occasional remix or new song included. It was released on December 10, 2008. This album sold a total of 4,039 copies. The Petit Best 9 DVD was released alongside the album. It features PVs related to the album tracks.