RIN may refer to:

• Royal Indian Navy, The naval force of British India
• Relative Intensity Noise, a noise term in fiber-optic communication

Rin can refer to:

• The , an obsolete unit of Japanese currency equal to  yen. Due to the drastic devaluation of Japanese money after World War II, the rin was eventually taken out of circulation at the end of 1953
• People with the Japanese given name "Rin" (Also transliterated as Lin or Lynn)
  • Rin Hirai, manga artist
  • Lynn Okamoto
  • Rin Takanashi
  • Rin Aoki, A Japanese model and AV actress

is a Japanese manga written by Satoru Kannagi and illustrated by Yukine Honami. It is licensed in North America by Digital Manga Publishing, which released the manga between 25 October 2006, and 25 April 2007. It is licensed in German by Carlsen Verlag.

Rin bezeichnet:

• historisch den 1000sten Teil eines Yen
• eine japanische Band: siehe Rin'
• einen Manga: siehe Rin!

Le Rassemblement pour l'indépendance nationale (RIN) est un parti politique voué à la promotion de l'indépendance du Québec qui a existé de 1960 à 1968.

Rin - drobna, brązowa moneta japońska bita w latach 1873 - 1919, o wartości 1/1000 jena.