The Shahnameh is the scene of the battle between the good and the evil, and man is the inactive spectator of this battle. Existentialism challenges this view of humanity and by breaking up the two forces replaces a third and superior power i.e. the human being. Existentialism therefore is a kind of humanism.According to Shahnameh, man’s effort has no effect on his destiny and man is powerless in the hands of destiny. Existentialism repudiates this view and considers man as the only builder of his destiny. In existentialism, no person is born a hero or an anti-hero, while in Shahnameh, all the heroes were born heroes and all the non-heroes were born as such. The keywords in existentialism are choice and anguish. Sartre’s heroes always find themselves in a situation charged with choice and anguish, a situation which many heroes of the Shahnameh, in most stories like Rostam and Sohrab, Rostam and Esfandiyar, Siavash, etc., also find themselves in many times. The purpose of the present article is to study parts of the Shahnameh from an existentialistic point of view and to show that in principles existentialism is in agreement with the Shahnameh but in certain minor points it agrees with it.