Carolus

Carolus may refer to:

People

 * Carolus (name)
 * the medieval Latin form of the name Charles
 * Charlemagne (742–814)
 * King Charles XII of Sweden, who is sometimes referred to as "Carolus Rex"

Scientific

 * Carolus (plant), a genus of flowering plants in the family Malpighiaceae
 * Carolus (planthopper), a genus of insects in the family Cixiidae
 * 16951 Carolus Quartus, an asteroid named after Charles IV, Holy Roman Emperor

Miscellaneous

 * Carolus (coin), several coins
 * Carolus, several ships; see List of Swedish ships of the line