Natsu may refer to:
- Leone di Cieli ver. Vongola, Tsuna's Sky-attribute Vongola Box Weapon.
- Nuts Version X, Nuts combined with the Ring of the Sky Version X.
- "Tsuna’s Box Weapon," the 244th chapter of the manga.
- "Sky Vongola Box," the 162nd episode of the anime series.
- "Leone di Cieli ver. Vongola," the 169th episode of the anime series.