Tsuki no Ookisa (月の大きさ?) is a coupling song for Nogizaka46's 7th Single Barrette. It was used as the 14th opening theme song for the anime Naruto Shippuden.
- Title: Tsuki no Ookisa (月の大きさ, Size of the Moon?)
- Artist: Nogizaka46
- Single: Barrette
- Lyrics: Akimoto Yasushi
- Composition and Arrangement: Furukawa Takahiro
- Music Video Director: Okubo Takuro
- Other Related Works: Naruto Shippuden
- 1st Generation: Shiraishi Mai, Hashimoto Nanami, Matsumura Sayuri, Nishino Nanase, Ikuta Erika, Ikoma Rina, Sakurai Reika, Wakatsuki Yumi, Takayama Kazumi, Ito Marika, Eto Misa, Akimoto Manatsu, Fukagawa Mai, Saito Asuka, Nakamoto Himeka, Kawago Hina
- 2nd Generation: Hori Miona
- Tsuki no Ookasa is the 14th opening theme song for Naruto Shippuden starting at episode 333 until episode 356.