Project Hail Mary is a 2021 science fiction novel by American novelist Andy Weir. Set in the near future, it centers on junior high (middle) school-teacher-turned-astronaut Ryland Grace, who wakes up from a coma afflicted with amnesia. He gradually remembers that he was sent to the Tau Ceti solar system, 12 light-years from Earth, to find a means of reversing a solar dimming event that could cause the extinction of humanity.

It received generally positive reviews, and was a finalist for the 2022 Hugo Award for Best Novel. The unabridged audiobook is read by Ray Porter.Film rights have been purchased by Metro-Goldwyn-Mayer. Drew Goddard (who adapted The Martian, Weir's traditional publishing debut, into a 2015 film) is slated to adapt the book into a film, in which actor Ryan Gosling plans to star as Grace.