Hirosaki Domain , also known as Tsugaru Domain , was a tozama feudal domain of Edo period Japan It is located in Mutsu Province, in northern Honshū. The domain was centered at Hirosaki Castle, located in the center of what is now the city of Hirosaki in Aomori Prefecture. It was ruled by the Tsugaru clan. A branch of the family ruled the adjoining Kuroishi Domain.

Hirosaki Castle is a hirayama-style Japanese castle constructed in 1611. It was the seat of the Tsugaru clan, a 47,000 koku tozama daimyō clan who ruled over Hirosaki Domain, Mutsu Province, in what is now central Hirosaki, Aomori Prefecture, Japan. It was also referred to as Takaoka Castle .