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 to 1974. He had previously served as the 36th vice president of the United States from 1953 to 1961, and prior to that as both a U.S.
Robyn Rihanna Fenty (; born 20 February 1988) is a Barbadian singer, songwriter, actress, and businesswoman.
Sir Richard Starkey (born 7 July 1940), known professionally as Ringo Starr, is an English musician, singer, songwriter and actor who gained worldwide fame as the drummer for the Beatles.
Richard I (8 September 1157 – 6 April 1199) was King of England from 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 was overlord of Brittany at various times during the same period.
Rio de Janeiro (; Portuguese: [ˈʁi.u d(ʒi) ʒɐˈne(j)ɾu]; River of January), or simply Rio, is the second-most populous municipality in Brazil and the sixth-most populous in the Americas.
The rings of Saturn are the most extensive ring system of any planet in the Solar System. They consist of countless small particles, ranging from μm to m in size, that orbit about Saturn.
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.