Yuval Noah Harari (Hebrew: יובל נח הררי [juˈval ˈnoaχ haˈʁaʁi]; born 1976) is an Israeli medievalist, military historian, public intellectual, and writer. He currently serves as professor in the Department of History at the Hebrew University of Jerusalem. He is the author of the popular science bestsellers Sapiens: A Brief History of Humankind (2011), Homo Deus: A Brief History of Tomorrow (2016), 21 Lessons for the 21st Century (2018), and Nexus (2024). His writings examine themes of free will, consciousness, intelligence, happiness, and suffering.

Harari writes about a "cognitive revolution" that supposedly occurred roughly 70,000 years ago when Homo sapiens supplanted the rival Neanderthals and other species of the genus Homo, developed language skills and structured societies, and ascended as apex predators, aided by the agricultural revolution and accelerated by the Scientific Revolution, which have allowed humans to approach near mastery over their environment. His books also examine the possible consequences of a futuristic biotechnological world in which intelligent biological organisms are surpassed by their own creations; he has said, "Homo sapiens as we know them will disappear in a century or so".

Harari's first book, Sapiens, is based on his lectures to an undergraduate world history class, but his work has been more negatively received in academic circles.