RN

RN or Rn may stand for:

• rn (newsreader), a Usenet news client
• RN the code for County Roscommon, Ireland
• RN: the memoirs of [US President] Richard Nixon
• Air Horizons, former airline, IATA code
• Resistencia Nacional, El Salvador political party
  • Fuerzas Armadas de la Resistencia Nacional, military arm of El Salvador party
• Province of Rimini's ISO 3166-2:IT code
• Radio National, Australia
• Radon (symbol Rn), a chemical element
• Registered Identification Number, US FTC code used on clothing labels
• Registered nurse
• Renovación Nacional or National Renewal (Chile), a Chilean political party
• Rio Grande do Norte, ISO 3166-2:BR code of the Brazilian state
• Round nose, a type of bullet
• Royal Navy, UK
• Ruch Narodowy, a Polish far-right political party
• Euclidean space with n dimensions, denoted by $\textbf{R}^n$ or $\mathbb{R}^n$
• Newline, represented as \r\n in certain operating systems