Phase 3, Phase III or Phase Three may refer to:
Media Marvel Cinematic Universe: Phase Three, eleven American superhero films from 2016–2019 Phase 3: Thrones and Dominions, a 1995 album by Earth Phase III (album), a 1972 album by the Osmonds Phase Three (album), a 2003 album by the Riverdales
Other MediaWiki's unofficial name during 2002 until 2003 Phase III clinical trials, the third of the phases of clinical research Phase 3 Eclipse, an American ultralight aircraft Phase 3 Productions Phase 3 metro station Phase III Offensive