Acacus can refer to:
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Acacus (mythology), King of Arcadia, and the foster-father of the infant Hermes in Greek mythology
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''Acacus'' (phasmid), a genus of phasmids in the family Diapheromeridae
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Tadrart Acacus
The Acacus Mountains or Tadrart Akakus ( / ALA-LC: ''Tadrārt Akākūs'') form a mountain range in the desert of the Ghat District in western Libya, part of the Sahara. They are situated east of the city of Ghat, Libya, and stretch north from th ...
, a region and mountain range in southwestern Libya
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