R18

R18, or R-18, may refer to:

Media content ratings

 * R18 (British Board of Film Classification)
 * R18+ issued by the Australian Classification Board
 * R18 issued by the New Zealand Classification Office
 * R18+ issued by Eirin in Japan
 * R-18 issued by the Philippine Movie and Television Review and Classification Board

Other uses

 * R18 (drone), a Ukrainian unmanned combat aerial vehicle
 * Audi R18, a Le Mans prototype racing car
 * BMW R18, a cruiser motorcycle made by BMW during the COVID-19 pandemic
 * R18: In use, may form flammable/explosive vapour-air mixture, a risk phrase
 * R18.com, a Japanese English-language adult website created by Hokuto Corporation
 * R-18 regional road (Montenegro)
 * Renault 18, a French automobile
 * Rubik R-18 Kánya, a Hungarian light aircraft
 * USS R-18 (SS-95), a submarine of the United States Navy