RN

RN or Rn may refer to:

Places
 Rio Grande do Norte, Brazilian state (ISO 3166-2:BR code RN)
 Province of Rimini, Italy (ISO 3166-2:IT code)
 County Roscommon, Ireland (code)

Science and technology
 Radon, symbol Rn, a chemical element
 Newline, represented as \r\n in certain operating systems
 Euclidean space, with n dimensions, denoted by  or 

Others
 National Rally (France) (Rassemblement national), a far-right French political party
 Royal Navy, UK
 Registered nurse, a licensed health care provider
 RN: the Memoirs of Richard Nixon, an autobiography