Onix may refer to:
- Onix (publishing protocol) (ONline Information eXchange), XML metadata formats for books publishers
- Onix (Pokémon), a rock-type creature in the Pokémon franchise
- ONIX (BBS), (Online Network for Information eXchange), an electronic Bulletin Board System (BBS) online continuously since April 1987, running Galacticomm MajorBBS software.
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