東野圭吾（Keigo Higashino、1958年2月4日 - ）は、大阪府大阪市生野区生まれ(本籍は東区玉造・現中央区)の小説家。

大阪市立小路小学校、大阪市立東生野中学校、大阪府立阪南高等学校、大阪府立大学工学部電気工学科卒業。大学在学中は、アーチェリー部の主将を務める。日本電装株式会社（現デンソー）に技術者として勤務しながら、推理小説を書き、1985年に『放課後』で第31回江戸川乱歩賞を受賞し、作家デビュー。退職後上京し、作家に専念。

1999年には『秘密』で第52回日本推理作家協会賞（長編部門）受賞。2006年、『容疑者Xの献身』で第6回本格ミステリ大賞（小説部門）、そして第134回直木賞を受賞。直木賞には、『秘密』『白夜行』『片思い』『手紙』『幻夜』と5度候補作に推薦されながら、全て落選しており、「最も直木賞から嫌われている男」とも言われたが、6度目の推薦でついに悲願達成となった。

受賞直後の記者会見での「落ちるたんびにやけ酒飲んで、みんなで選考委員の悪口言って、普通の人はできない面白いゲームやったな。今日は勝てて良かった」という、スパイスの効いたコメントが話題となった。

Winner of the Japan Mystery Writers Award, Naoko is a black comedy of hidden minds and lives. Navigating the interstices between the real and the unreal with perfect plot twists, this page-turner is also a critique of gender relations by a male Japanese writer, one of their best-sellng.

An everyman, Heisuke works hard at a factory job to provide for his wife, Naoko, and young daughter, Monami. He takes pleasure from the small things, like breakfast with both of them after a night shift. His placid life is rocked when, looking up from his microwave dinner one evening, he realizes the TV news that he wasn't paying attention to is reporting a catastrophic bus accident and the names of his loved ones.

When Monami finally wakes from a coma, she seems to think she's Naoko, who has died protecting her daughter. More disturbingly, the girl knows things only Naoko could know. The family life that resumes between the modest man and a companion who looks like his daughter bu seems like his dead wife is ticklish-funny until it begins hurtling toward a soul-shattering end.

In addition to winning Japan's top mystery prize, Naoko inspired a blockbuster movie. Read this work, a match for the later Bunuel, to find out why Higashino is considered the most ambitious and versatile mystery hand at work in Japan.