Ro or RO may refer to:
Romania ( (listen) ro-MAY-nee-ə; Romanian: România [romɨˈni.a] (listen)) is a country located at the crossroads of Central, Eastern, and Southeastern Europe.
Ronald Wilson Reagan (; February 6, 1911 – June 5, 2004) was an American politician who served as the 40th president of the United States from 1981 to 1989. Prior to his presidency, he was a Hollywood actor and union leader before serving as the 33rd governor of California from 1967 to 1975.
Robin McLaurin Williams (July 21, 1951 – August 11, 2014) was an American actor and comedian. Born in Chicago, Williams began performing stand-up comedy in San Francisco and Los Angeles during the mid-1970s, and is credited with having led San Francisco's comedy renaissance.
Rome (Latin and Italian: Roma [ˈroːma] (listen)) is the capital city and a special comune of Italy (named Comune di Roma Capitale).
Roger Federer (German pronunciation: [ˈrɔdʒər ˈfeːdərər]; born 8 August 1981) is a Swiss professional tennis player who is currently ranked world No.
Rajmund Roman Thierry Polański (born 18 August 1933) is a French-Polish film director, producer, writer, and actor.
Robert Anthony De Niro Jr. (, Italian: [de ˈniːro]; born August 17, 1943) is an American-Italian actor, producer, and director.
The Royal Navy (RN) is the United Kingdom's naval warfare force. Although warships were used by the English kings from the early medieval period, the first major maritime engagements were fought in the Hundred Years' War against the Kingdom of France.