Ryoki Inoue (born José Carlos Ryoki de Alpoim Inoue, 22 July 1946) is a Brazilian writer purported to be the most prolific author. In 1996, he had published over 1,000 Portuguese-language books across 39 different pseudonyms. Before becoming a writer, Inoue was a medical doctor.
Inoue was born José Carlos Ryoki de Alpoim Inoue on 22 July 1946 in São Paulo to a Japanese father and Portuguese mother.
In 1993, Inoue was recognised with a Guinness World Record for publishing the most books. Inoue had published 15 more books by the time the certificate arrived in Brazil.