Type 31
Type 31 (also Type 31 ) stands for:
- Goliath Jagdwagen Type 31 , a car model of the automobile manufacturer Goliath
- NSB Type 31 , Norwegian steam locomotive series
- Peugeot Type 31 , a car model made by the car manufacturer Peugeot
- 75 mm field gun Type 31 , Japanese field gun of the Imperial Japanese Army
- Type 31 75 mm mountain gun , Japanese mountain gun of the Imperial Japanese Army