Hisaya Shiraiwa, born June 23, 1955 in Kyoto Prefecture, Japan, is a manga author and original creator. He is a graduate of Doshisha University. Shiraiwa is primarily recognized as the writer behind the manga Ganglion, which was later adapted into an anime television series. His professional credits include work as a film producer for live-action movies such as R100 from 2013 and Symbol from 2009.

As a manga author, Shiraiwa wrote the story for Ganglion, a Japanese drama manga that was illustrated by Takashi Itsuki. The series was serialized by Yoshimoto Books in its Comic Yoshimoto magazine, running from June 19, 2007 to September 18, 2007. The complete series was later compiled into a single tankobon volume, which was published jointly by Yoshimoto Books and Wani Books on April 25, 2009.

Shiraiwa is credited as the original creator for the anime adaptation of Ganglion. This short-form anime television series was produced by Studio Maf and premiered in October 2025, nearly two decades after the manga's initial serialization. His work on Ganglion represents a significant contribution to the medium, with the project spanning both print and animated formats across an extended production timeline. While Shiraiwa is documented as the writer and original author for this property, the artistic duties for the manga were handled separately by illustrator Takashi Itsuki, indicating a collaborative approach to the creation of the work.