was a Japanese waka poet of the early Kamakura period. He was also an accomplished kemari player. and one of his poems was included in the Ogura Hyakunin Isshu.
He was a son of , and the ancestor of the Asukai family, who were known for their skill at both poetic composition and kemari. Being of Fujiwara stock, he was also known as . Among his grandchildren was the poet Masaari. He made a private collection, the Asukai-shà «, which was posthumously edited by his grandson in 1292. Twenty-two of his poems were included in the Shin Kokin Wakashà «, and a total of 134 in the imperial anthologies.
Masatsune served three emperors, Go-Toba, Tsuchimikado and Juntoku, in addition to working under the Kamakura shogunate.
Masatsune studied waka under Fujiwara no Shunzei and from 1201 served in the . He served as one of the compilers of the Shin Kokin Wakashà «, along with Shunzei's son Teika. Some twenty-two of his own poems were included in the imperial collection. A total of 134 of his poems were included in it and later imperial collections. He also compiled a private waka collection, the , which was edited by his grandson Masaari in 1292.
The following poem by him was included as No. 94 in Teika's famous Ogura Hyakunin Isshu: