RO2
# RO2

RO2 can stand for one of the following:

* Red Orchestra 2: Heroes of Stalingrad
* Ragnarok Online 2: Legend of the Second
   * Ragnarok Online 2: The Gate of the World, the cancelled version of the above game
* Organic peroxide or other compounds with the peroxide group
* Japanese submarine Ro-2, an Imperial Japanese Navy submarine commissioned in 1920 and stricken in 1932
