Firefly may refer to:
- "Firefly", a song by CRUMP featuring Fukase.
- "Firefly" (蛍 (Hotaru)), a song by HarryP featuring Hatsune Miku.
- "Firefly" (ホタル (Hotaru)), a song by KEI featuring Hatsune Miku.
- "Firefly", a song by nakano4 featuring Sekka Yufu.
- "Firefly" (蛍 (Hotaru)), a song by PENGUINS PROJECT featuring Hatsune Miku.
- "firefly", a song by Teniwoha featuring Hatsune Miku.
- "Firefly" (螢 (Hotaru)), a song by Tomoya featuring Namine Ritsu.
- "FireFly" (萤火 (Yínghuǒ)), a song by ZClear featuring Xingchen.
- "Firefly Girl", a song by SpookyInSpace featuring RUBY.
- "My Firefly", a song by Elisile featuring CYBER DIVA.
See also Hotaru (disambiguation), Yinghuo (disambiguation).