In His Steps is a best-selling religious fiction novel written by Charles Monroe Sheldon. First published in 1896, the book has sold more than 50,000,000 copies, and ranks as one of the best-selling books of all time. The full title of the book is In His Steps: What Would Jesus Do?

Though variations of the subtitle "What would Jesus do" have been used by Christians for centuries as a form of imitatio dei, the imitation of God, it gained much greater currency following publication of the book.