Tsugaru District, Mutsu

 was a district located in the old province of Mutsu, Japan (now in current Aomori Prefecture). The district once had a land in southern Hokkaido but in 1878, the district dissolved by splitting up into 5 districts.
As the Tsugaru Domain, the area was considered a "de facto" province in its own right, and even today Japan Rail and other local railroad stations prefix "Tsugaru-" to their names instead of "Mutsu-" as in stations in the rest of Aomori Prefecture.