Discourse markers are multufunctional linguistic units. Their purpose is to organise speech in a logical and meaningful way. Since textbooks are relevant in foreign language learning, it is important for them to provide a lot of discourse markers so students can acquire them at the very beginning. The aim of this study was to investigate the frequency of discourse markers in textbooks of Croatian publishers Školska knjiga and Profil Klett and the British publisher Oxford University Press. The prevalence of the most common discourse markers was also investigated. The analysis was performed by comparing textbooks for the second, fourth, sixth and eighth grade. In the textbook of the Croatian publishing house for the second grade, the discourse marker okay does not occur, unlike the English textbook in which it constituted almost two thirds of all discourse markers. As far as the fourth grade is concerned, the markers but and and are equally represented, while in the textbooks for the sixth grade the marker and is the most represented in both publishing houses. The results of the analysis show that in the textbooks for the eighth grade, the discourse marker and still dominates among Croatian publishers, and other markers are used less frequently. On the other hand, the discourse marker and appears less often in the English textbook, but unlike Croatian publishers, markers but, so and well dominate. The results of the textbook analysis display that the textbooks of the Oxford University Press publishing house have a higher share of discourse markers in the total number of words compared to the textbooks of Croatian publishing houses.