Yōseiden (妖星伝, Legend of an Enchanted Planet) is a multi-part science fiction/fantasy literary series by Ryō Hanmura.

The series is generally regarded as a classic in the world of Japanese science fiction.

In SF Magazine, it was voted as one of the top ten Japanese science fiction novels of all time alongside Hanmura's other masterpiece Musubi no Yama Hiroku (産霊山秘録).

The narrative concerns the exploits of the Dark Emperor Gido, the alien leader of a demonic anti-Shinto faith known as "Kido".

Desiring to conquer the earth, he sends forth several disembodied alien entities to possess human hosts in 17th century Japan.