Codex could refer to:
- The Black Codex, a data storage system used by the secret Star Cabal
- The Codex, a product of DarkStryder technology that looked like a small pyramid with a metallic surface
- The Codex, a book written by the treasure hunter Brin Hesk'l
- The Codex Chitinous, a religious text adhered to by the Order of Extermination
- The Codex of Karness Muur, an ancient Sith document
- The Codex of Tython, a Jedi holocron
- The Supercommando Codex, a guideline for Mandalorian behavior
- The Taurannik Codex, a dark side codex
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