Lynn Okamoto is a Japanese manga artist, known in Japanese as Okamoto Rin, who has created several notable series that have been adapted into anime. Born on January 6 in Wakayama Prefecture, he is a former employee of both Arc System Works and Bandai, where he worked on the development of puzzle games for the Sailor Moon franchise. He left Bandai at the age of 28 to pursue his ambition of becoming a professional manga writer. He is known to be a private individual and resides in Tokyo.

Okamoto made his debut in January 2000 with a short story also titled Elfen Lied, a romantic story about young musicians that bears no connection to his later, famous work of the same name. His breakthrough came with the serialization of Elfen Lied in Shueisha's Weekly Young Jump from 2002 to 2005. The series, which tells the story of a young girl with powerful telekinetic vectors who escapes a scientific laboratory, was adapted into a 13-episode anime television series and an original video animation (OVA) by the studio ARMS in 2004. He served as a consultant on this anime adaptation.

Following the success of Elfen Lied, Okamoto created several other serialized works. Nononono, a romantic drama centered on the sport of ski jumping, ran from 2007 to 2010. Brynhildr in the Darkness, often considered a spiritual successor to Elfen Lied, was serialized from 2012 to 2016 and also received an anime adaptation by ARMS in 2014. While he typically both writes and illustrates his stories, a notable exception is Kimi wa Midara na Boku no Joō, for which he provided the story while the art was drawn by Mengo Yokoyari. His later works include Parallel Paradise, which began serialization in Kodansha's Weekly Young Magazine in 2017, marking a departure from his previous long-term association with Shueisha.

Recurring themes in Okamoto's work include elements of science fiction, horror, and dramatic conflict centered on themes of alienation, discrimination, and prejudice. He has stated that he does not use these themes for the purpose of social commentary but rather as a source for drama, emotion, and conflict. Despite the graphic violence present in series like Elfen Lied and Brynhildr in the Darkness, he has expressed a personal preference for love stories and comedic material over pure horror. In an interview, he cited the manga series Blade of the Immortal and Baki the Grappler as significant influences on his work.

In the broader manga industry, Okamoto's significance is marked by both critical recognition and accolades. Weekly Young Jump has referred to him as an "unconventional" and "gifted" author. His influence is such that a main-belt asteroid, 49382 Lynnokamoto, was named in his honor in 2018. He also made a minor, one-time appearance as a voice actor for a background character in the twelfth episode of the Elfen Lied anime.