RO

RO or ro refer to:

As a name:
* Randy Orton, pro wrestler
* Ro (language), an artificial language created by Edward Powell Foster
* Ro (pharaoh), an early pharaoh
* Ro, Italy, a city in the province of Ferrara, Italy (not to be confused with Rho, Italy)
* Ro (kana), Japanese kana
* Ro (title), a title of nobility in Fiji
* Ro Laren, a character in the Star Trek series
* Ro, shorthand for Ronan

As an initialism, acronym, or symbol:

* RO, The ISO 3166-1 alpha-2 country code for Romania
* ro, the ISO 639-1 alpha-2 code for the Romanian language
* RO, the IATA code for TAROM, the flag carrier airline of Romania
* Autoantigen Ro, also known as Calreticulin
* Reverse osmosis, the process of pushing a solution through a filter that traps the solute on one side
* Receive only, a type of teleprinter that contains neither a keyboard nor punched tape equipment
* Relaxation oscillation
* Reach Out, an Australian website created to help young people through tough times
* Ragnarok Online, an MMORPG
* Regnum Online, an MMORPG
* Royal Ordnance, a British arms manufacturer, which is now part of BAE Systems Land Systems
* Red Orchestra (spy), a Soviet operation during World War II
* , a first-person tactical shooter total conversion for Unreal Tournament 2004
* , a WW2 realism based online FPS based on the Unreal Engine
* Read-only memory (ROM), a type of storage media
* Read-only access to files or directories in file system permissions
* Reserve Officers' Training Corps (ROTC)
* Junior Reserve Officers' Training Corps (JROTC)
* Restraining order, a court order that forbids a party from continuing a particular activity
* Radical Orthodoxy, a form of Chrisitan postliberal theology
* Russian Orthodox, a member of the Eastern Orthodox Church of Russia
* Right only, the right channel of the stereo "Left only/Right only" downmix

See also

* R0 (R zero)
* Rho
* ROH
* Ro-ro, short for Roll-on/roll-off vessels
* RO Renewables Obligation