Arcanum may refer to:

• Arcanum (album), a 1996 album by Acoustic Alchemy
• The Arcanum (album), a 2000 album by Suidakra
• Arcanum, a piece of music by Ezequiel Viñao
• Arcanum, song off the album Dog Whistle by Show Me the Body
• Arckanum, a black metal band

• Arcanum, Ohio, a village in the United States
• Arcanum (encyclical), a 1880 Catholic encyclical letter
• Arcanum (comics), an American comic book published by Image Comics
• Arcanum: Of Steamworks and Magick Obscura, a 2001 computer role-playing game
• The Arcanum (role-playing game), a 1981 pen-and-paper role-playing game
• The Arcanum (novel), a 2005 novel by Thomas Wheeler
• The Arcanum (non fiction), a 1998 non-fiction book on the history of porcelain
• Arcanum, a Conex Research-proposed space probe in the exploration of Neptune
• The Grand Arcanum, the secret of the philosopher's stone in alchemy

• Arcandam
• Arcana (disambiguation)
• Arcane (disambiguation)
• All pages with titles beginning with Arcan