Existential Physics: A Scientist's Guide to Life's Biggest Questions is a nonfiction popular science book by theoretical physicist Sabine Hossenfelder that was published by Viking Press on August 9, 2022.

[2] The book begins with a preface that contains a mental health warning due to the content challenging personal beliefs of readers, with Hossenfelder describing herself as an "agnostic heathen".

An epilogue is included that concludes with the question "Is the universe made for us" and a discussion of the anthropic principle and how physics observations might bias our understanding of life's existence.

[3] Writing for the Wall Street Journal, Julian Baggini said that the book is an "informed and entertaining guide to what science can and cannot tell us" and that while Hossenfelder may be "too opinionated" at points, the reader "will quickly forgive her" since trying to combine the "concerns of the human world and the baffling complexities of physics" has given her the right to be so.

[5] Bethanne Patrick in the Los Angeles Times called Existential Physics the "most entertaining book" of the month and recommended that readers have an "open mind" and "enjoy the ride".