Lifespan: Tenbun 23 (1554) (?) to Tenshō 6 (1578)
Lord: Amago Haruhisa → Hachisuka clan
Father: Amago Sanehisa (or Takahisa)
Siblings: Ujihisa, Yoshihisa, Suehisa, Tsunehisa, Katsuhisa, Michihisa
Amago Michihisa served as a retainer of the Amago clan of Izumo Province. Michihisa was the sixth son of Amago Sanehisa. He was a regarded in the clan as an expert marksman with the arquebus. In 1554, Amago Haruhisa, lord of the clan, slayed many members of the elite force of soldiers led by Amago Kunihisa known as the shingūtō. Michihisa fled to another province, became a retainer of the Hachisuka clan, and leader of their infantry unit. In 1577, Michihisa joined Amago Katsuhisa and Yamanaka Yukimori in a bid to restore the Amago clan by confronting the Mōri. The plan resulted in defeat at the Battle of Kōzuki Castle in 1578. As ringleaders of the rebellion, Michihisa joined Katsuhisa, Yukimori and Amago Ujihisa in killing themselves.
Under another story, Michihisa was a younger brother of Katsuhisa, and he fled to Hōki Province. The Shōun Temple in Hōki bears his name as having laid the foundation.