Montenegrin is a normative variety of the Serbo-Croatian language mainly used by Montenegrins and is the official language of Montenegro. Montenegrin is based on the most widespread dialect of Serbo-Croatian, Shtokavian, more specifically on Eastern Herzegovinian, which is also the basis of Standard Croatian, Serbian, and Bosnian.

Bosnian, sometimes referred to as Bosniak language, is the standardized variety of the Serbo-Croatian pluricentric language mainly used by ethnic Bosniaks. Bosnian is one of three such varieties considered official languages of Bosnia and Herzegovina, along with Croatian and Serbian. It is also an officially recognized minority language in Croatia, Serbia, Montenegro, North Macedonia and Kosovo.