On average, when the diglossia of the Gypsies is discussed in the Hungarian, Czech and Slovak literature, this term is used for their bilingualism without specifying their social surroundings and language use. In this paper I would like to set out to amend this shortcoming in research by looking at the main characteristic features of diglossia and then trying to compare them with writings of Hungarian and Slovak Gypsies. On the basis of investigations in two different communities and of other Hungarian, Slovak and Czech sociolinguistic papers (which also deal with the language use of Gypsy communities) I would like attempt to point out those characteristic points of diglossia which also exist in the investigated communities. My conclusion is that diglossia exists only in isolated and introverted communities which usually do not have contacts with the non-Gypsy environment. Because of the changing lifestyle in this area, the number of these groups is steadily decreasing. This means that speaking about the diglossia of the speech communities requires in-depth research; otherwise the results will not reflect the linguistic reality.