In Entertainment
- Phase (band), an alternative rock band
- "Phases", a box set of albums by The Who
- "Phases" (Buffy episode), an episode of the TV series Buffy the Vampire Slayer
- Phases (.hack), fictional monsters in the .hack franchise
- Phase IV, a 1974 science fiction movie directed by Saul Bass
- Phase, an incarnation of the DC Comics character usually known as Phantom Girl
- Phaze, an alternate world in Piers Anthony's Apprentice Adept series
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