RI or Ri may refer to:
Richard Milhous Nixon (January 9, 1913 – April 22, 1994) was the 37th President of the United States from 1969 until 1974, when he resigned from office, the only U.S.
Robyn Rihanna Fenty (; born February 20, 1988) is a Barbadian singer, songwriter, and actress. Born in Saint Michael and raised in Bridgetown, she first entered the music industry by recording demo tapes under the direction of record producer Evan Rogers in 2003. She ultimately signed a recording contract with Def Jam Recordings after auditioning for its then-president, hip hop producer and rapper Jay Z.
Rio de Janeiro (; Portuguese pronunciation: [ˈʁi.u d(ʒi) ʒɐˈnejɾu]; River of January), or simply Rio, is the second-most populous municipality in Brazil and the sixth-most populous in the Americas.
Richard I (8 September 1157 – 6 April 1199) was King of England from 6 July 1189 until his death. He also ruled as Duke of Normandy, Aquitaine and Gascony, Lord of Cyprus, Count of Poitiers, Anjou, Maine, and Nantes, and Overlord of Brittany at various times during the same period.
Rick Yutaka Fowler (born December 13, 1988) is an American professional golfer who plays on the PGA Tour.
Richard Starkey, MBE (born 7 July 1940), known professionally as Ringo Starr, is an English drummer, singer, songwriter and actor who gained worldwide fame as the drummer for the Beatles.
Richard Phillips Feynman (; May 11, 1918 – February 15, 1988) was an American theoretical physicist known for his work in the path integral formulation of quantum mechanics, the theory of quantum electrodynamics, and the physics of the superfluidity of supercooled liquid helium, as well as in particle physics for which he proposed the parton model.