Phase 1
Phase 1, Phase I or Phase One may refer to:

Media
Marvel Cinematic Universe: Phase One, six American superhero films from 2008–2012
Phase One (Art Ensemble of Chicago album), 1971
Phase One (Saga album), 1998
Phase One, renamed Bloodwork (film), a 2012 American-Canadian thriller

Other
Phase I clinical trials, the first of the phases of clinical research
Canadian Phase I, a powered parachute design
Phase I metabolism, Phase I reaction in drug metabolism
Phase I environmental site assessment, a report prepared for a real estate holding which identifies potential or existing environmental contamination liabilities
Phase 1 (bar), a lesbian bar and nightclub at 525 8th Street, Southeast in Washington, D.C
Phase One (company), a Danish camera equipment company
Phase 1 metro station
Phase One Media Pro
Phase One Endurance

See also
Phase (disambiguation)