Mutsu is a city located in Aomori Prefecture, Japan. As of 31 January 2023, the city had an estimated population of 53,804 in 28553, and a population density of 62 persons per km2. The total area of the city is 864.12 square kilometers (333.64 sq mi), making it the largest municipality in Aomori Prefecture in terms of area.

Mutsu Bay is a bay located within Aomori Prefecture, in the northern Tōhoku region of northern Japan. It has an east-west distance of approximately 40 kilometers and a north-south distance of approximately 40 kilometers at its eastern end, with a total area of approximately 1,667.89 square kilometers.