Tsugaru Nobuaki (津軽 信著, April 16, 1719 – March 10, 1746) was the 6th daimyō of Hirosaki Domain in northern Mutsu Province, Honshū, Japan (modern-day Aomori Prefecture).

His father died in 1730, and when Nobuhisa retired in 1731, he appointed his grandson Nobuaki as his successor.

The domain suffered from flooding followed by drought, earthquakes, volcanic eruptions (by Mount Iwaki and other volcanoes in Hokkaidō), tsunami, inclement weather, and repeated crop failures, which led to widespread famine and disease.

Nobuaki continuing developing new paddy fields and irrigation works, and encouraged research of rangaku to help resolve the domain's problems and ever-increasing debt.

However, almost as a final straw, the castle town of Hirosaki burned down in a great fire on May 11, 1746, and Nobuaki died two weeks later of sickness, at age 26.