O1
O1 or O-1 may refer to:
Aircraft
- 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
Military
- NATO Rank O-1
- O-1, the pay grade for the following officer ranks in the U.S. uniformed services:
- Second Lieutenant in the Army, Air Force, and Marine Corps
- Ensign in the Navy, Coast Guard, Public Health Service Commissioned Corps, and NOAA Commissioned Officer Corps
- USS O-1 (SS-62), lead ship of the United States O class submarines
- HNLMS O 1, a Royal Netherlands Navy O class submarine
Other
- O1 type star, a subclass of O-type star
- O-1 tool steel, a type of oil-hardening tool steel
- O-1 visa
- Haplogroup O1 (Y-DNA), a Y-DNA haplogroup
- SP&S Class O-1, a steam locomotives class
- Otoyol 1, a Turkish highway around Istanbul
- Ö1, an Austrian radio station
- O1 Communications, Inc., a California telecommunications company
- GNR Class O1, a class of British 2-8-0 steam locomotive designed by Nigel Gresley (later redesignated Class O3)
- LNER Thompson Class O1, a class of British 2-8-0 steam locomotive designed by Edward Thompson and rebuilt from Class O4
See also
- 01 (disambiguation)
- Ö1, Austrian radio station
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