"Sen'yū" (戦友, Comrades) is a Japanese gunka released in 1905 following the Russo-Japanese War. The lyrics were written by Hisen Mashima, and the song was composed by Kazuoki Miyoshi. The first verse, along with that of "Fujin Jūgunka" (婦人従軍歌), was used in the interlude of 's song, "". The melody also served as the basis for "Daigaku no Uta" (大学の歌, Song of the University), which was written by Yukitoki Takigawa and published in Asahi Shimbun.