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 his resignation in 1974 and was the only president to resign from office.
Robyn Rihanna Fenty (; born 20 February 1988) is a Barbadian singer, businesswoman, diplomat, actress and songwriter.
Sir Richard Starkey (born 7 July 1940), known professionally as Ringo Starr, is an English musician, singer, and actor who gained worldwide fame as the drummer for the Beatles.
Rio de Janeiro (; Portuguese: [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 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.
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.
Richard Blumenthal (; born February 13, 1946) is an American attorney and politician who has served as a United States Senator from Connecticut since 2011. He is a member of the Democratic Party.