Title: Bosnian language
Content:   The Bosnian language (bosanski / босански ) is the standardized variety of Serbo-Croatian 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. Bosnian uses both the Latin and Cyrillic alphabets, with Latin in everyday use. It is notable among the varieties of Serbo-Croatian for a number of Arabic, Ottoman Turkish and Persian loanwords, largely due to the language's interaction with those cultures through Islamic ties. Bosnian 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 Montenegrin varieties. Therefore, the Declaration on the Common Language of Croats, Serbs, Bosniaks and Montenegrins was issued in 2017 in Sarajevo. Until the 1990s, the common language was called Serbo-Croatian and that term is still used in English, along with "Bosnian-Croatian-Montenegrin-Serbian" (BCMS), especially in diplomatic circles.
Title: Bosniaks
Content:  Most Bosniaks speak the Bosnian language, a South Slavic language of the Western South Slavic subgroup. Standard Bosnian is considered a variety of Serbo-Croatian, as mutually intelligible with the Croatian and Serbian languages which are all based on the Shtokavian dialect. As result, paraphrases such as Serbo-Croat-Bosnian (SCB) or Bosnian/Croatian/Serbian (BCS) tend to be used in English on occasion. At the vernacular level, Bosniaks are more linguistically homogeneous than Serbs or Croats who also speak non-standard dialects beside Shtokavian. With respect to lexicon, Bosnian is characterized by its larger number of Ottoman Turkish (as well as Arabic and Persian) loanwords (called Orientalisms) in relation to the other Serbo-Croatian varieties. The first official dictionary in the Bosnian language was published in 1992. Church Slavonic is attested since at least the Kingdom 
Title: Bosnian Church
Content:  The Bosnian Church used Slavic language in liturgy.
Title: Languages of North Macedonia
Content:  Bosnian (bosanski, босански) is another standardized register of Serbo-Croatian, spoken by Bosniaks. As a standardized form of the Shtokavian dialect, it is one of the three official languages of Bosnia and Herzegovina. Most of the Bosnian-speaking Macedonian citizens live in Skopje and the Municipality of Veles.
Title: Bosnian language
Content:  under the control of the Ottoman Empire) that remained entirely pure without Turkish speakers, both in the villages and so on the highlands. Further he states "[...] a language other than the Bosnian is not spoken [in Bosnia], the greatest Turkish [i.e. Muslim] gentlemen only speak Turkish when they are at the Vizier". ; Ivan Kukuljević Sakcinski, a 19th-century Croatian writer and historian, stated in his work Putovanje po Bosni (Travels into Bosnia) from 1858, how the 'Turkish' (i.e. Muslim) Bosniaks, despite converting to the Muslim faith, preserved their traditions and the Slavic mood, and that they speak the purest variant of the Bosnian language, by refusing to add Turkish words to their vocabulary. 
Title: Demographics of Bosnia and Herzegovina
Content:  as Serbo-Croatian. Use of one of the three varieties has become a marker of ethnic identity. Michael Kelly and Catherine Baker argue: "The three official languages of today's Bosnian state...represent the symbolic assertion of national identity over the pragmatism of mutual intelligibility". All standard varieties are based on the Ijekavian varieties of the Shtokavian dialect (non-standard spoken varieties including, beside Ijekavian, also Ikavian Shtokavian). Serbian and Bosnian are written in both Latin and Cyrillic (the latter predominantly using the Latin script), whereas Croatian is written only in Latin alphabet. There are also some speakers of Italian, German, Turkish and Ladino. Yugoslav Sign Language is used with Croatian and Serbian variants. According to the results of the 2013 census, 52.86% of the population consider their mother tongue to be Bosnian, 30.76% Serbian, 14.6% Croatian and 1.57% another language, with 0.21% not giving an answer.
Title: Bosnian language
Content:  The differences between the Bosnian, Serbian, and Croatian literary standards are minimal. Although Bosnian employs more Turkish, Persian, and Arabic loanwords—commonly called orientalisms— mainly in its spoken variety, it is very similar, to both Serbian and Croatian in its written and spoken form. "Lexical differences between the ethnic variants are extremely limited, even when compared with those between closely related Slavic languages (such as standard Czech and Slovak, Bulgarian and Macedonian), and grammatical differences are even less pronounced. More importantly, complete understanding between the ethnic variants of the standard language makes translation and second language teaching impossible." The Bosnian language, as a new normative register of the Shtokavian dialect, was officially introduced in 1996 with the publication of Pravopis bosanskog jezika in Sarajevo. According to that work, Bosnian differed from Serbian and Croatian on some main linguistic characteristics, such as: sound formats in some words, especially "h" (kahva versus Serbian kafa); substantial and deliberate usage of Oriental ("Turkish") words; spelling of future tense (kupit ću) as in Croatian but not Serbian (kupiću) (both forms have the same pronunciation). 2018, in the new issue of Pravopis bosanskog jezika, words without "h" are accepted due to their prevalence in language practice.
Title: Bosnia and Herzegovina–Serbia relations
Content:  Serbs and Bosniaks ethnolinguistically belong to the South Slavic peoples. The majority of population in Serbia and Bosnia and Herzegovina speak Serbo-Croatian. One of its standard varieties, Serbian, is official in both countries. Bosnian and Croatian, the other varieties of Serbo-Croatian official in Bosnia and Herzegovina, are recognized as minority languages of Serbia.
Title: Bosniaks
Content:  Not to be confused with Bosnians. For other uses, see Bosniaks (disambiguation). "Bosnian Muslims" redirects here; for other uses, see Bosnian Muslims (disambiguation). Bosniaks or Bosniacs (Bošnjaci, ; singular masculine: Bošnjak, feminine: Bošnjakinja) are a South Slavic nation and ethnic group native to the Southeast European historical region of Bosnia, which is today part of Bosnia and Herzegovina. A native minority of Bosniaks live in other countries in the Balkans; especially in the Sandžak region of Serbia and Montenegro (where Bosniaks form a regional majority), and in Croatia and Kosovo. Bosniaks are typically characterized by their historic ties to the Bosnian historical region, adherence to Islam since the 15th and 16th centuries, culture, and the 
Title: National language
Content:  Bosnia and Herzegovina's de facto sole national language is Serbo-Croatian. It is officially defined under the three names Bosnian, Croatian and Serbian, corresponding to the country's constituent nations. The Latin and Cyrillic alphabets both have official status.

Question: what language do bosnian muslims speak?
Answer: Bosnian language.