ACOS or Acos may refer to:
- Arccosine, an inverse trigonometric function
 - The Advanced Comprehensive Operating System mainframe computer operating system
 - Acos District in Peru
 - Acos Vinchos District in Peru
 - A Crown of Swords novel
 
See also
Search for "acos"  on Wikipedia.
- Aco (disambiguation)
 - Cos (disambiguation)
 - All pages with titles beginning with Acos
 - All pages with titles containing Acos
 
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