Orr or ORR may also refer to:
Acronyms Objective response rate, or overall response rate, a parameter in clinical trials for pharmaceutical products Office of Rail and Road, a regulatory body in the United Kingdom Office of Refugee Resettlement, a program of the US Administration for Children and Families Operational Readiness Review (ORR), used by the US government Open-road racing, mostly on closed down public roads in sparsely populated areas of the Southern US Orchestre Révolutionnaire et Romantique, a British classical orchestra Outer Ring Road (disambiguation), a series of roads in various places Oxygen reduction reaction, a type of chemical reaction
Places Orr, Kentucky, United States, an unincorporated community Orr, Minnesota, United States, a small city Orr, West Virginia, United States, an unincorporated community Orr, a district of Pulheim, Germany Orr Glacier, Victoria Land, Antarctica Orr Island, Marie Byrd Land, Antarctica Orr Peak, Ross Dependency, Antarctica Urr Water, Scotland, United Kingdom, archaically known as the River Orr Orr Formation, a geologic formation in Utah, United States
People Orr (surname), including a list of people with this name Orr Barouch (born 1991), Israeli footballer
Fictional characters Orr (Catch-22), a fictional character in the novel Catch-22 and the film adaptation George Orr, protagonist of the science-fiction novel The Lathe of Heaven by Ursula K. Le Guin and two film adaptations
Other uses Oldham-Ramona-Rutland School District 39-6 Orr Academy High School, a public high school in Chicago, Illinois, United States Orr School, Texarkana, Arkansas, United States, on the National Register of Historic Places Yorketown Airport, IATA airport code "ORR"
See also Ore (disambiguation) Orr-Ewing Baronets Orr's Island, Maine, United States