Carolus Rex frequently refers to King Charles XII of Sweden
Carolus Rex (Latin: King Charles) may also refer to:
- King Charles (disambiguation), kings named Charles, who in Latin documents and on 17th-century English coins are referred to as "Carolus Rex"
- Carolus Rex (bastion), a portion of the Gothenburg city wall
- Carolus Rex (album), a 2012 album by Sabaton
- Carolus Rex March, a Swedish military march composed by Wilhelm Harteveld
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