Philological studies on The Book of Dede Korkut mostly consist of interpretations/corrections of the words that are thought to be read erroneous by previous researchers or determining scribal errors on the text which lead to the accurate interpretation, reading and reconstruction of it. Such studies are required to constitute the impeccable and error-free form of the text. However, while doing this, other related studies on the text, be it language-internal or extra-linguistic, must not be neglected. By this means, more details on the text will be reached; text-concerned issues such as the writing period and writing conditions of it as well as aesthetical and literal value of the text and many more matters related to it will be understood better. In the present study, discourse markers, which emerge as an inherent property of colloquial language, will be touched upon at first. Subsequent to this, discourse markers in The Book of Dede Korkut that can be interpreted as traces of colloquial language will be dealt with and evaluated. Thereby, an approach from the perspective on the basis of colloquial language in The Book of Dede Korkut will be developed and it will be aimed for contributing on discourse analyses for the text. © 2020, Ahmet Yesevi University. All rights reserved.