By Arcana one can mean any of the following:
- Campaign settings:
- Unearthed Arcana for the use with the first edition of Advanced Dungeons & Dragons
- Unearthed Arcana for the use with the third edition of Dungeons & Dragons
- Arcana Unearthed - a 2003 setting book for Monte Cook's Arcana capmaign setting.
- Arcana Evolved - a 2005 update of Arcana Unearthed
- Arcana: Societies of Magic - a d20 system sourcebook by Green Ronin Publishing