Crazy may refer to:
- "Crazy", a song by Engaku Asobi featuring Hatsune Miku and flower.
- "CRAZY", a song by negidarake featuring CUL.
- "Crazy", a song by Shunmei Kambe featuring VY1.
- "CRAZY", a song by Yamaguchitarou featuring Hatsune Miku.
- "CRAZY", a song by YATORA featuring SOLARIA.
- "CRaZY" (CR詠ZY), song by Umetora feauturing Hatsune Miku, Kagamine Rin, Megurine Luka, GUMI and IA.
- "Crazy Beat" (クレイジー・ビート), a song by Satsuki Ga Tenkomori featuring Hatsune Miku and Kagamine Len.
- "Crazy Clown" (クレイヂィ・クラウン), a song by Intro-P featuring KAITO and Hatsune Miku.
- "Crazy Grenade Bomber Crasher" (クレイジーグレネードクラッシャーボンバー), a song by Akibawota-P featuring CUL.
- "Crazy me", a song by Turbo-P featuring MAIKA.
- "Crazy ∞ nighT", a song by Hitoshizuku-P featuring multiple VOCALOIDs.
- "Crazy Oppai" (Crazy おっぱい), a song by Akibawota-P featuring Hatsune Miku.
- "Crazy Pig" (クレイジーピッグ), a song by T-POCKET featuring Kagamine Rin.
- "Crazy theater", a song by Kurozumi-P featuring MAYU.
See also Crazy for You (disambiguation), Crazy Town (disambiguation), Go Crazy (disambiguation)