This paper carries out an intensive study of Heidegger's famous reflection on the word dao and of his citations from the Daodejing, with the purpose of elucidating his complex relation with Daoist thinking. First I examine whether dao could be said to be a guideword for Heidegger's path of thinking. Then I discuss Heidegger's citations, in six places of his writings, from five chapters of the Daodejing, by situating them in the immediate textual context as well as against the broad (...) background of the fundamental presuppositions and orientations of Heidegger and Laozi's thinking. My examination of Heidegger's citations from the Daodejing has for the first time gathered together all the relevant materials discovered so far. (shrink)