Kō no Morofuyu (高師冬?, ? – 13 February 1351 (Nengocalc: Kannō 2, 17th day, 1st month)) was, together with his cousinsMoronao and Moroyasu, one of shogun Ashikaga Takauji's most important generals during the Nanboku-chō period. He was adopted as a son by Moronao. He was kami (守・長官? highest of the four administrative positions of the ritsuryō system) of Mikawa province, shugo (governor) of Musashi province and Kantō kanrei. Defeated by Uesugi Noriaki during the Kannō Disturbance, he committed seppuku in Kai in 1351.
Like many others men of this period, he began his career in 1336, at the end of the Kemmu restoration. He fought many battles all over the country, including 1336's attack to Mount Hiei. In 1338, together with cousin Moroyasu, he went to fight against Southern court forces in Aonohara, Mino province, to help contain Kitabatake Akiie, who was threatening Kyoto. The next year he was made Kantō shitsuji, counsellor to Ashikaga Yoshiakira, holding the post until 1944. He proved successful in this role against both the pro-Ashikaga Tadayoshi Uesugi clan and against Hitachi province's Kitabatake Chikafusa, who was the main military force behind the Southern court. He defeated Chikafusa first in December 1341 and then two years later, finally driving him out of Kantō. He was concurrently also shugo of Musashi province from 1341 to 1344.