O1
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- See also: 01
O1 or O-1 may be referring to:
- O-1 Bird Dog an observation aircraft manufactured by Cessna
- O-1 Falcon an observation aircraft manufactured by the Curtiss Aircraft Company
- O-1 Airship an Italian manufactured semi-rigid airship operated by the US Navy
- O-1 visa
- O1 star, a subclass of O-class stars
- Y-DNA Haplogroup O1
- Otoyol 1, Turkish highway around Istanbul
- Austrian Radio Ö1 International
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