Baiōken Eishun (Japanese: 梅翁軒永春; active c. 1710–1755) was a Japanese painter and print artist of the Kaigetsudō school of ukiyo-e art. He is also alternatively known as Hasegawa Eishun 長谷川永春, Baiōken Nagaharu, Takeda Harunobu and a number of other art-names. He produced both hanging scroll full-color paintings typical of the Kaigetsudō style and mode, and a number of designs for illustrations for woodblock printed books.
Richard Lane describes Eishun's work as very similar to that of Matsuno Chikanobu, though the courtesans in his bijinga (paintings of beauties) are somewhat taller, slimmer, and more serious-looking. Eishun, along with Chikanobu, represents something of a revival of the Kaigetsudō school which fell into decline in the preceding decades following the exile of its founder, Kaigetsudō Ando, in 1714.