Orr

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