The Mitchell submachine gun was an experimental submachine gun originating from New Zealand.
On the 10th of December 1943, the Director of Artillery of the British Army made a request to the Secretary of the Ordnance Board that trials be arranged for a new submachine gun from New Zealand, the Mitchell submachine gun. This request was passed on to the Inspection Department, who investigated the weapon. It was described as weighing about 4lb and using a STEN magazine. The barrel length was 5 inches. The barrel was said to get excessively hot during continuous firing, and the muzzle flash was too great. The trigger mechanism was also said to be faulty, and during tests the buttstock fell off. It was returned to New Zealand for a redesign, but there are no records of any improved models being produced.