The Type 3 13 mm fixed aircraft machine gun (Japanese: 三式十三粍固定機銃, romanized: San shiki jyū-san mirimētoru kōtei kijū) was a Japanese Navy aircraft machine gun used during World War II.

The Type 3 was derived from the .50 in (12.7 mm) M2 Browning but chambered for the slightly larger 13.2×99mm Hotchkiss round, the same cartridge as the Hotchkiss M1929 machine gun and the Imperial Japanese military's licensed version, the Type 93 heavy machine gun.

Despite the small difference in calibers, it was possible to use M2 Browning cartridges in the Japanese machine gun, which ostensibly occurred during World War II.

The fixed version was used on later models of the Mitsubishi A6M Zero fighter[1] and prototypes of the Kawanishi N1K Shiden Kai.

[4] The flexible version was ultimately rejected in favour of the lighter Type 2 machine gun.