Homo Deus: A Brief History of Tomorrow (Hebrew: ההיסטוריה של המחר, English: The History of the Tomorrow) is a book written by Israeli author Yuval Noah Harari, professor at the Hebrew University in Jerusalem. The book was first published in Hebrew in 2015 by Dvir publishing; the English-language version was published in September 2016 in the United Kingdom and in February 2017 in the United States.

As with its predecessor, Sapiens: A Brief History of Humankind, Harari recounts the course of human history while describing events and the individual human experience, along with ethical issues in relation to his historical survey. However, Homo Deus (from Latin "Homo" meaning man or human and "Deus" meaning God) deals more with the abilities acquired by humans (Homo sapiens) throughout their existence, and their evolution as the dominant species in the world. The book describes mankind's current abilities and achievements and attempts to paint an image of the future. Many philosophical issues are discussed, such as humanism, individualism, transhumanism, and mortality.