The Philosopher's Stone is a 1969 horror novel by the English writer Colin Wilson.

It tells the story of two researchers who find a way to reach a higher state of consciousness, which leads to frightening revelations about humanity's distant history.

Like Wilson's 1967 novel The Mind Parasites, The Philosopher's Stone uses motifs from H. P. Lovecraft's Cthulhu Mythos.

Clifford P. Bendau wrote in Colin Wilson, the Outsider and Beyond from 1979: "The human striving for an inept management of freedom is, once again, the issue in The Philosopher's Stone.

"[1] In his 1982 book The Novels of Colin Wilson, Nicolas Tredell also made comparisons to The Mind Parasites, and wrote that "The Philosopher's Stone is a much more substantial and, in some ways, more satisfactory novel".