Orr
- Design review (U.S. government)
- Objective response rate
- Office of Rail and Road
- Office of Refugee Resettlement
- Oldham-Ramona-Rutland School District 39-6
- Open-road racing
- Orchestre Révolutionnaire et Romantique
- Ore (disambiguation)
- Orr (Catch-22)
- Orr (surname)
- Orr Academy High School
- Orr Barouch
- Orr Formation
- Orr Glacier
- Orr Island
- Orr Peak
- Orr School
- Orr's Island
- Orr, Kentucky
- Orr, Minnesota
- Orr, West Virginia
- Orr-Ewing Baronets
- Outer Ring Road (disambiguation)
- Oxygen reduction reaction
- Pulheim
- The Lathe of Heaven
- Urr Water
- Yorketown Airport