Öz Mulla Sadra and Heidegger are two different philosophers, of two separated philosophical traditions, who both concern to the problem of existence, and then time. They try to discover many virtues of time and its relation to existents. Heidegger emphasizes on Dasein for understanding the essence of the Being, he considers an essential relation between time and being by studying many manifestations of Dasein, like temporality. Mulla Sadra takes into consideration all material existents as temporal things and tries to show their essential virtues in the light of time. He considers time as the fourth dimension of everything and the base of its evolutionary movement to spirituality. In this paper, it is tried to comparatively study temporality and time in Mulla Sadra and Heidegger's philosophy, in order to find their similarities and differences.