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