Codex Guelferbytanus may refer to:
- Codex Guelferbytanus A
- Codex Guelferbytanus B
- Codex Guelferbytanus 64 Weissenburgensis, which contains in the lower text of the palimpsests: Codex Guelferbytanus A, Codex Guelferbytanus B, and Codex Carolinus.
Codex Guelferbytanus may refer to: