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)

Politics

 * National Rally (France) (Rassemblement national), a far-right French political party
 * Resistencia Nacional, a revolutionary socialist party in El Salvador
 * Renovación Nacional or National Renewal (Chile), a liberal conservative party in Chile
 * Ruch Narodowy, a Polish far-right political party
 * Fuerzas Armadas de la Resistencia Nacional, was the military arm of the National Resistance, a Salvadoran communist organization
 * Resistencia Nicaragüense, Nicaraguan Contra rebels

Science and technology

 * Radon, symbol Rn, a chemical element
 * rn (newsreader), a Usenet news client
 * Newline, represented as \r\n in certain operating systems
 * Euclidean space, with n dimensions, denoted by $$\textbf{R}^n$$ or $$\mathbb{R}^n$$
 * Round nose, a type of bullet
 * Recurrent nova, a class of repeating cataclysmic variable stars

Other

 * Royal Navy, UK
 * Radio National, Australia
 * Registered nurse, a licensed health care provider
 * RN: the Memoirs of Richard Nixon, an autobiography
 * Registered Identification Number, a US FTC code used on clothing labels
 * RN, then IATA code of Air Horizons, a former French airline
 * RN, then IATA code of Rayani Air, a former Malaysian airline
 * Kirundi language (ISO 639-1: RN)