Eastern Herzegovinian
istočnohercegovački источнохерцеговачки
Language family	Indo-European Balto-Slavic Slavic South Slavic Western Serbo-Croatian Shtokavian Neo-Shtokavian Eastern Herzegovinian
Standard forms	Croatian Bosnian Serbian Montenegrin
Dialects	Užican
Language codes
ISO 639-3	–
Glottolog	east2821
Eastern Herzegovinian (yellow) is the most widespread Shtokavian dialect, though it is not native to the capitals of any of the five republics where it is official. The map represents the extent of Eastern Herzegovinian according to Pavle Ivić, with the addition of a small community in Slovenia.

The Eastern Herzegovinian dialect (/ˌhɛərtsəɡəˈviːniən, ˌhɜːr-, -ɡoʊ-, -ˈvɪn-/,^[1][2] Serbo-Croatian: istočnohercegovački dijalekt / источнохерцеговачки дијалект) is the most widespread subdialect of the Shtokavian supradialect or language, both by territory and the number of speakers. It is the dialectal basis for all modern literary Serbo-Croatian standards: Bosnian, Croatian, Serbian, and Montenegrin (the latter only partially codified).

It covers large areas of Croatia, Bosnia-Herzegovina, Serbia and Montenegro. It is also spoken in four villages in White Carniola, Slovenia (Miliči, Bojanci, Marindol and Paunoviči), the inhabitants of which are descendants of Uskoks. It is composed of two larger zones that are territorially separated:

• Southeastern zone, where it originated from (eastern Herzegovina, western Montenegro, western Serbia, eastern Bosnia, Posavinan Podrinje)
• Northwestern zone (western and northwestern Bosnia, northern Dalmatia with Gorski Kotar, narrower strips of Croatia, parts of Slavonia and Baranja, White Carniola and Žumberak)

As can be seen from the map, the southeastern zone is territorially compact and continuous, while the northwestern zone is broken, discontinuous and interspersed with areas where other Shtokavian dialects are spoken.

Being spoken on such a large area, Eastern Herzegovinian comes into contact with all of the other Shtokavian dialects, except those of the Prizren-Timok zone, and also on northwest with the dialects of two other Western South Slavic (Croatian) dialects: Chakavian and Kajkavian. It is also spoken in a few enclaves on Chakavian and Kajkavian areas, and in several contact points it borders with Slovene dialects. On the north it borders with Hungary, where it is also spoken in a few enclaves along the border near Danube, as well as on the outskirts of Budapest.^[3]

In the south this dialect covers the area between the river of Neretva and River Dubrovačka inlet, the area of Dubrovnik and Dubrovnikan littoral, eastern half of the Pelješac peninsula, the island of Mljet, Konavle and Herzegovinian area, along the Adriatic cost all the way to Risno in the Bay of Kotor. On the territory of modern Montenegro it covers Old Herzegovina with Grahovo, northern Plješivica, Župa, Lukovo, Drobnjaci, Uskoci, Rovci, Kolašin and Morača.^[4]

During the turbulent period of Bosnian war 1992–1995, marked by large-scale migrations of the native population, Eastern Herzegovinian spread significantly in the area of Bosnia-Herzegovina. During the Croatian War of Independence 1991–1995 however, the number of Eastern Herzegovinian speakers significantly dropped, following the flight of some 300,000 Croatian Serbs, all of whom spoke the dialect. In the post war-period, as the refugees return to their homes, the number of speakers in the territory of Croatia has been increasing steadily.^[5]

• Lisac, Josip (2003), Hrvatska dijalektologija 1 – Hrvatski dijalekti i govori štokavskog narječja i hrvatski govori torlačkog narječja [Croatian dialectology 1 – Croatian dialects and speeches of the Shtokavian dialect and Croatian speeches of the Torlakian dialect], Zagreb: Golden marketing – Tehnička knjiga, ISBN 953-212-168-4
• Okuka, Miloš (2008), Srpski dijalekti [Serbian dialects], SKD Prosvjeta, ISBN 978-953-7611-06-4