Hermetic or related forms may refer to:
- of or related to the ancient Greek Olympian god Hermes
- of or related to Hermes Trismegistus, a legendary Hellenistic figure based on the Greek god Hermes and the Egyptian god Thoth
- Hermetica, the ancient and medieval writings attributed to Hermes Trismegistus, mainly dealing with astrology, alchemy, magic, and religious philosophy
- Hermeticism, or Hermetism, a religio-philosophical system that is primarily based on the Hermetica
- Hermetic Qabalah, an esoteric tradition syncretizing several forms of belief
- Hermeticism (poetry), or Hermetic poetry, a form of obscure poetry where the sound of words is as important as their meaning
- Hermetic seal, an airtight seal
- Hermetic Press, a publishing company in Seattle, specializing in technical literature on magic and mentalism
- Hermética, an Argentine heavy metal band
- Hermética (album), their 1989 debut album
- Hermeticum (album), a 1998 album by Moonspell
