Howard Phillips "H. P." Lovecraft (August 20, 1890 – March 15, 1937) was an American author of horror, fantasy and science fiction, especially the subgenre known as weird fiction.

Lovecraft's guiding literary principle was what he termed "cosmicism" or "cosmic horror", the idea that life is incomprehensible to human minds and that the universe is fundamentally alien. Lovecraft is best known for his Cthulhu Mythos, as well as the Necronomicon, a fictional grimoire of magical rites and forbidden lore. His works often challenged the values of the Enlightenment, Romanticism, Humanism and Christianity.

Lovecraft's themes and ideas have had a profound effect on culture and literature in general, and have embedded themselves into the foundation that is used for horror associated with the strange.