RN or Rn may refer to:

• 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)

• Radon, symbol Rn, a chemical element
• Newline, represented as \r\n in certain operating systems
• Euclidean space, with n dimensions, denoted by ${\displaystyle {\textbf {R}}^{n}}$ or ${\displaystyle \mathbb {R} ^{n}}$

• 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^{[broken anchor]}, an autobiography

This disambiguation page lists articles associated with the title RN. If an internal link led you here, you may wish to change the link to point directly to the intended article.