The philosopher Heraclitus has been renowned for a great amount of time. Despite that fact the remaining fragments of his work have just recently been assembled to the composed form they have today. Among these fragments there are a couple of terms that stands out amongst others; one of them is the term logos. The main focus of this thesis is devoted to the mystery and usage of the term logos, which comes into a great display in fragment number 50. The ambition of the thesis is to evaluate and compare three interpreters’ readings of Heraclitus while having a close focus on his usage of the word logos in fragment 50. One of these interpreters, Martin Heidegger, may have the most radical reading of Heraclitus’ logos among the three. Because o...