Based on Martin Heidegger s considerations concerning technology, according to which the dominance of technology in force nowadays manifests itself as the appearance of being the only possibility of comprehension of reality, which is the great danger of our time, our guiding question here is about the existential uncanniness and its possibility in our time. The phenomenon of the uncanny is thematized by Heidegger in more detail in Being and time, his seminal work. Considering the historical-ontological character of this work, our starting point will be to demonstrate the historical determinations that led Heidegger to the guiding question of Being and time, that is, the questioning of the meaning of Being. Having established this, we will reconstruct the essential steps of the existential analytic that befits the phenomenon of uncanniness, aiming to demonstrate its essential relationship with themes such as the everydayness, anxiety, care, death and authenticity. Uncanniness will prove itself to be an inseparable phenomenon of the fundamental attunement, which, in Being and time, is the anxiety. The question concerning technology, on the other hand, appears in Heidegger s late thought, that is, after the turn in his thought. We aim to demonstrate, therefore, that after the turn there was no abandonment of the achievements obtained in Being and time, but quite the opposite: the considerations about the uncanny as presented in the existential analytic seem to be indispensable to our contemporary task of thinking, for the properly dealing with technology and its devices seems to require an essential uncanniness of its undisputed dominance.