Ro or RO may refer to:
Roger Federer (German pronunciation: [ˈrɔdʒər ˈfeːdərər]; born 8 August 1981) is a Swiss professional tennis player who is currently ranked world No.
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 and film actor 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.
Rome (Latin and Italian: Roma [ˈroːma] (listen)) is the capital city and a special comune of Italy (named Comune di Roma Capitale).
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 leading San Francisco's comedy renaissance.
Robert Anthony De Niro Jr. (, Italian: [de ˈniːro]; born August 17, 1943) is an American actor, producer, and director.
The Romani (also spelled Romany , ), colloquially known as Gypsies or Roma, are an Indo-Aryan ethnic group, traditionally itinerant, living mostly in Europe and the Americas and originating from the northern Indian subcontinent, from the Rajasthan, Haryana, and Punjab regions of modern-day India.Genetic findings appear to confirm that the Romani "came from a single group that left northwestern India about 1,500 years ago".
Rock music is a broad genre of popular music that originated as "rock and roll" in the United States in the early 1950s, and developed into a range of different styles in the 1960s and later, particularly in the United Kingdom and in the United States.