This article deals with the Katta Langar manuscript, which is known as one of the earliest Qur'ān copies attributed to III. Caliph Uthman. The study consists of an introduction, a conclusion and two sections. The introduction section begins with the information that the Katta Langar Mushaf which is called by this name relative to the Katta Langar village of Uzbekistan, is in the library of the Tashkent Uzbekistan Muslims Administration. Only ninety-seven pages of the mushaf, which was lost for a (...) period, have survived. Since twelve of these leaves appear again in Katta Langar, they are meant as the Katta Langar manuscripts. Therefore, this article not only aims to examine in detail all the extant leaves of the mushaf but also the twelve leaves, which are known today as the Katta Langar manuscripts. Although the research done so far has made it clear that this mushaf is not one of the copies of Uthman, the mushaf has been the subject of many studies. The first of the studies on the Katta Langar Mushaf was published by M.E. Masson, while the most detailed work belongs to Efim Rezvan. Existing studies on the mushaf are methodologically either a publication or a catalogue study. In this study, the Katta Langar copy was compared with the sources of the mushaf literature and discussed more comprehensively. (shrink)