Jippensha Ikku (十返舎 一九, 1765 – September 12, 1831) was the pen name of Shigeta Sadakazu (重田 貞一), a Japanese writer active during the late Edo period of Japan. He lived primarily in Edo in the service of samurai, but also spent some time in Osaka as a townsman. He was among the most prolific yellow-backed novel (黄表紙 kibyōshi) writers of the late Edo period — between 1795 and 1801 he wrote a minimum of twenty novels a year, and thereafter wrote sharebon (洒落本), kokkeibon (滑稽本) and over 360 illustrated stories (合巻 gōkan).