Kitabatake Akiie (北畠 顕家?, 1318 – June 10, 1338) was a Japanese court noble, and an important supporter of the Southern Court during the Nanboku-chō Wars. He also held the posts of Commander-in-Chief of the Defense of the North, and Governor of Mutsu Province. His father was Imperial advisor Kitabatake Chikafusa.
In 1333, Akiie was ordered to accompany the six-year-old eighth son of Emperor Go-Daigo, Prince Norinaga, to Mutsu, where the Prince became Governor-General of Mutsu and Dewa. These two large provinces constituted much of the north-western end of Honshū, the area now known as Tohoku. Soon afterwards, he was appointed to the post of Chinjufu Shogun, or Commander-in-Chief of the Defense of the North. This was a position that had been held by Minamoto no Yoshiie two hundred years earlier. A number of families formed a league under his direction, supporting the Southern Court; these included the samurai families of Yūki, Date, Nambu, Soma, and Tamura. The Soma and several other daimyō were convinced to change sides by Takauji, however.
Three years later, he led an army nominally under the command of Norinaga to the outskirts of Kyoto to reinforce the forces of Nitta Yoshisada against Ashikaga Takauji. Nitta and Kitabatake were aided by warrior monks from Enryakuji, and the temple of Miidera, whose monks supported Ashikaga Takauji, was burned to the ground.
Traveling to Kyūshū, Kitabatake gathered support for the Southern Court in the absence of Ashikaga Takauji, one of the strongest leaders of the Northern Court.
In 1337, despite facing opposition at home in the north, Kitabatake was ordered by Emperor Go-Daigo to come to the aid of his army to the south of Kyoto. Kitabatake led his forces slowly south, fighting the Northern Court in many battles. He was defeated at Tonegawa before pushing south and occupying Kamakura, the capital of the Ashikaga shogunate, and making his way to Nara, fighting at Iga and Sekigahara. In Nara, while trying to rest and reorganize his forces, he was set upon by Kō no Moronao and barely escaped to Kawachi Province. He recouped and pushed through enemy forces at Tennōji (near modern-day Osaka), but was eventually defeated and killed at Izumi in 1338 at the age of twenty. His death is described in the epic Taiheiki and in his father's Jinnō Shōtōki.