The Hermetica are texts attributed to the legendary Hellenistic figure Hermes Trismegistus, a syncretic combination of the Greek god Hermes and the Egyptian god Thoth. These texts may vary widely in content and purpose, but by modern convention are usually subdivided into two main categories, the "technical" and "religio-philosophical" Hermetica.

Hermes Trismegistus is a legendary Hellenistic period figure that originated as a syncretic combination of the Greek god Hermes and the Egyptian god Thoth. He is the purported author of the Hermetica, a widely diverse series of ancient and medieval pseudepigraphica that lay the basis of various philosophical systems known as Hermeticism.