The Holy Blood and the Holy Grail (retitled Holy Blood, Holy Grail in the United States) is a controversial book by Michael Baigent, Richard Leigh, and Henry Lincoln, which was based in large part on Pierre Plantard’s Priory of Sion.

The book was first published in 1982 by Jonathan Cape in London, as a follow-up to a BBC TV documentary on the series Chronicle. A sequel to the book, called The Messianic Legacy, was published in 1987. The original work was reissued in an illustrated hardcover version in 2005.