Ro or RO may refer to:
Romania ( ( listen) ro-MAY-nee-ə; Romanian: România i[romɨˈn[unsupported input][unsupported input]a]) 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 actor who served as the 40th President of the United States from 1981 to 1989. Prior to the presidency, he was a Hollywood actor and trade union leader before serving as the 33rd Governor of California from 1967 to 1975.
Rome (Italian: Roma [ˈroːma] ( listen); Latin: Roma [ˈroːma]) is the capital city of Italy and a special comune (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 in the mid-1970s, and is credited with leading San Francisco's comedy renaissance.
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.
The numeric system represented by Roman numerals originated in ancient Rome and remained the usual way of writing numbers throughout Europe well into the Late Middle Ages.