Ajisai may refer to:
- "Ajisai" (アジサイ), a song by La+ featuring Nekomura Iroha.
- "Ajisai" (アジサイ), a song by Nia featuring GUMI.
- "Ajisai" (紫陽花), a song by PaletteP featuring MEIKO.
- "AJISAI", a song by Sohta featuring Kaai Yuki.
See also Hydrangea (disambiguation)