Orc (disambiguation)
- Apache ORC
- Canons Regular of the Holy Cross of Coimbra
- ORC License
- Odd radio circle
- Odonata Records Committee
- Offshore Racing Congress
- Offshore Raiding Craft
- Ohio Revised Code
- Opinion Research Corporation
- Orc (Blake)
- Orc (Warcraft)
- Orc (Warhammer)
- Orc (album)
- Orc (programming language)
- Orc (slang)
- Orca
- Orchard MRT station
- Order of Railway Conductors
- Oregon City (Amtrak station)
- Organic Rankine Cycle
- Organized retail crime
- Origin recognition complex
- Ork (disambiguation)
- Orlando Furioso
- Orocue Airport
- Orsimer
- Otago Regional Council
- Ottawa Rowing Club
- Ottoman Railway Company