The author’s aim is to define the so-called linguistic norm of Middle Armenian using specially developed criteria and linguistic models, and to apply this framework to the study of Middle Armenian. This research presents a methodological and preliminary attempt to address this issue. The linguistic norm is considered essential for the Middle Armenian period, as this is the era in which various forms of Armenian emerge and gain broad usage. A linguistic norm represents the status of a language during a certain time – whether it is stable and systematic or unstable and disorganized. For this reason, the author proposes the following necessary criteria for defining the linguistic norm in Middle Armenian: a) absolute and relative, b) general (societal) and individual (private), c) written (literary) and oral (colloquial), d) comprehensive and segmented in time. The author concludes that it is impossible to define a single unified linguistic norm for the entire Middle Armenian period as one coherent system of rules. One must take into account its diversity and irregularities across centuries. Thus, it may be more appropriate to speak of a mixed type of linguistic norm - dominated by variations and inconsistencies - or to distinguish between multiple linguistic norms that together encompass all linguistic areas as a whole. The author also suggests adopting the regional linguistic feature as a criterion for the linguistic norm of Middle Armenian, which would clarify the localization of dialectal features according to specific regions.