Phase 1

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

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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