In the article “Latin language in the world created by J.K. Rowling” we discuss the spells derived from the Latin language, which were created by J.K. Rowling in the series of books about Harry Potter. Linguistic analysis of spells has shown that incantation formulas derived from Latin constitute the vast majority of all spells. The power of a spell always comes from its etymology. However, it is impossible to indicate the rules according to which the novelist created the formulas of spells. Some recurring features of the linguistic transformations can be discerned. Noted qualities of Rowling’s language include the variety and free use of Latin as a vocabulary base for spells.