Amago Haruhisa (March 8, 1514 – January 9, 1561) was a powerful daimyō and warlord in the Chūgoku region of western Japan. Born as the second son of Amago Masahisa, he initially bore the name Akihisa, but in 1541, upon an offer from Ashikaga Yoshiharu, he adopted the name Haruhisa by incorporating a kanji character from Yoshiharu's own name.

Upon the untimely death of his father, Amago Masahisa, in battle, Haruhisa assumed leadership of the Amago clan in 1537, succeeding his grandfather. Eager to expand his territory, he launched a series of invasions, extending his influence as far as Harima. During his youth, he was known by the name Saburōshirō.

The Siege of Koriyama in 1540, pitting Haruhisa against Mōri Motonari, concluded in a humiliating defeat. This led to the defection of many of his retainers, who doubted Haruhisa's prospects for success. The subsequent year saw the passing of his grandfather, Amago Tsunehisa, and Ōuchi Yoshitaka initiated a counteroffensive to crush the Amago clan.

In the 1542–43 Siege of Toda Castle, Haruhisa successfully defended the castle. This victory not only bolstered his standing but also inspired the return of some of his earlier defectors. With sufficient forces gathered, he managed to repel the invasion and gradually solidified control over domains like Izumo, Hōki, Mimasaka, and Oki.

Following the death of Ōuchi Yoshitaka in 1551 due to the rebellion led by Sue Harukata, Haruhisa was offered lordship over eight domains by the Muromachi shogunate in 1552, four of which he already held in his firm grasp.

In his later years, Haruhisa made a sudden decision to eliminate his uncle Amago Kunihisa, along with the retainers under his command, collectively known as Shingūtō. This action, which initially led to a scarcity of experienced leaders, was likely a move by Haruhisa himself to consolidate his rule over the Amago clan, rather than a plot by Mori Motonari as depicted in certain fictional works.

After Sue Harutaka's defeat and death in the Battle of Miyajima, Haruhisa sought to claim Iwami, forming an alliance with the Ogasawara clan of Iwami to seize control of the Omori Silver Mine. This sparked a series of battles with no clear victor. In late 1560, while engaged in battle against Motonari, Haruhisa fell ill at Gassantoda Castle and passed away on January 9, 1561.

Amago Hisayuki, as documented in Unyo Gunjitsuki, remarked that Haruhisa was "Quick to act, yet lacked the strategic discipline of a seasoned general; eager for combat, yet not inclined towards forgiveness."

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