An orc is a mythological and fictional creature.

Orc or ORC may also refer to:

• Orc (Blake), a character in the work of William Blake
• Orc (Warcraft)
• Orc (Warhammer)
• l'Orco, a sea monster in the poem Orlando Furioso
• Orsimer, or orcs, in The Elder Scrolls video games

• Odd radio circle, unexplained astronomical object
• Odonata Records Committee, verifies dragonflies in the UK
• Offshore Racing Congress, for maritime yacht racing
• Offshore Raiding Craft, a boat operated by the Royal Marines
• Ohio Revised Code, statutes of the U.S. state of Ohio
• Opinion Research Corporation, a polling and market research company
• O.R.C., postnominal letters for members of the Canons Regular of the Holy Cross of Coimbra
• Order of Railway Conductors, an American trade union
• Organic Rankine Cycle
• Organized retail crime
• Origin recognition complex, a protein complex
• Otago Regional Council, New Zealand
• Ottawa Rowing Club, a Canadian rowing club
• ORC License

• ORC, Amtrak station code for Oregon City (Amtrak station), Oregon, United States
• ORC, IATA airport code for Orocue Airport, Orocue, Colombia
• ORC, MRT station abbreviation for Orchard MRT station, Singapore
• Ottoman Railway Company

• Apache ORC, a file format
• Orc (album), an album by Oh Sees
• Orc (programming language)
• Orcs: First Blood, a series of books by Stan Nicholls
• Orc (slang), a pejorative term used in Ukraine for a Russian soldier in the Russo-Ukrainian War

• Ork (disambiguation)
• Orca