Shtokavian dialect
Croats speak Croatian, a South Slavic lect of the Western South Slavic subgroup. (Standard) Croatian is sometimes considered a normative variety of Serbo-Croatian, and is mutually intelligible with the other three national standards, Serbian, Bosnian, and Montenegrin (see Comparison of standard Bosnian, Croatian, Montenegrin and Serbian) which are all based on the Shtokavian dialect.