RON may refer to:

  • Polish–Lithuanian Commonwealth (Rzeczpospolita Obojga Narodów), a dualist monarchy of Poland and Lithuania
  • Re-open Nominations, a British ballot option similar to "none of the above"
  • Research Octane Number, an octane rating measurement method
  • Rise of Nations, a real-time strategy computer game
  • Romanian leu, ISO 4217 currency code for the currency of Romania
  • Rota Osobogo Naznacheniya (рота особого назначения), a 1940s unit of Russian commando frogmen