Type 31
# Type 31

Type 31 may refer to:

* Type 31 frigate, a class of Frigate currently being built for the Royal Navy
* Type 31 75 mm mountain gun, a field gun of the Imperial Japanese Army
* a version of the M2 mortar produced in the Republic of China
* Type 31 Grampus I, a variant of the Bristol Grampus, an early British prototype aircraft
* Villiers 31, an early French passenger aircraft
* Tupolev Tu-85, a Soviet prototype aircraft, designated as Type 31 by the US Air Force
* Hispano-Suiza Type 31, an early Spanish aircraft engine
* Peugeot Type 31, an early French motor vehicle
* an early Datsun motor vehicle
* Type 31 Alphabetical Duplicating Punch, an IBM keypunch
