Article is devoted to a research of functions of a lie in the art world of Dostoyevsky. The lie is considered as the special cognitive and life-creating element inherent in many heroes of F.M. Dostoyevsky. The analysis of a number of artistic images allows to draw a conclusion that a lie in Dostoyevsky›s interpretation is a vastly multifunctional phenomenon. In ability to «lie» the creative, altruistic onset which makes an artistic image more complex and multifaceted is reflected. The absence of especially pragmatical motivation to a lie is capable to enrich an image of a hero in aesthetic dimension. The elements of a lie promote disclosure of creative imagination of the hero. These elements interface contextual interrelations. In a state of altered consciousness, the hero is capable unexpectedly «to lie through to the truth», to the supra-historical truth and prophecies.