This paper is an attempt to reconstruct the form of existence of linguistic nationalism in Hungary in the period of the Dual Monarchy, to trace the main ingredients of that linguistic ideology. The author's aim is not to explore and contrast the various prominent and less prominent individual views of the period but rather to reconstruct a general, collective system of ideas and values that underlies their apparent multiplicity and that is more or less constant throughout the period at hand. As a result of that reconstruction, partial and non-definitive as it might be, a rather abstract and complex system of views emerges; but one has to observe that the abstract system of views at issue had important practical consequences with respect to the everyday linguistic behaviour of the communities carrying it and especially those forced to be confronted with it. Quite a few specific forms of linguistic behaviour of the period (such as the practice of language cultivation, the language shift of linguistic minorities of Hungary, changes in the use and functions of languages and language varieties spoken in Hungary, changes in the system of those languages and varieties, etc.) can eventually be explained in the light of that linguistic ideology.