Fairy tale, as the most widely read kind of children's literature, is full of mysticism, miraculous and supernatural. In a world where everything is possible, it is easy to forget the outside, real world, which especially attracts children and adults. Heroes, animals, princes and princesses, fairies and numbers are just some of the features of a fairy tale that offers endless possibilities for finding the right answers and identification with the characters. This work is based on the symbolism of the number three in certain fairy tales, it is connection with the development of personality, maturing and becoming independent. As a rounded, perfect number, in which is the foundations of many interpretations and symbolism, we could say that it has no end and that we will be able to look for its meaning, again and again. Interpretation of the fairy tales by Bruno Bettelheim (2000) and his view of the number three in fairy tales, we found out that the number three is connected with our inner conflicts. Psychoanalysis written by Marie-Louise von Franz (2007) shows the hidden aspects of male and female elements. At the end of the brief we gave insight into the meaning of the number three, it came to religion and all other aspects of human life.