R31

R31 or R-31 may refer to:

Automobiles

 * Nissan Pintara (R31), a compact car sold in Australia
 * Nissan Skyline (R31), a mid-size car
 * Renault R31, a Formula One racing car

Aviation

 * R31 (airship), of the Royal Navy
 * Renard R.31, a Belgian reconnaissance aircraft
 * Rubik R-31 Dupla, a Hungarian training glider

Other uses

 * R-31 (missile), a Soviet submarine-launched ballistic missile
 * R31 (South Africa), a road
 * Chlorofluoromethane, a refrigerant
 * Herero language
 * HMS Warrior (R31), an aircraft carrier of the Royal Navy
 * R31: Contact with acids liberates toxic gas, a risk phrase