Which ethnic groups were a part of the former Yugoslavia? Croats, Serbs, Bosnian Muslims, Macedonians Janjaweed Israelis, Palestinians, Arabs Hutu & Tutsis Croats, Serbs, Bosnian Muslims, Macedonians Janjaweed Israelis, Palestinians, Arabs Hutu & Tutsis Solution The ethnic group can be defined as a social category based on common culture or nationality. In other words, it can be said that an ethnic group is a category of people who recognize with each other based on similarities for example as a common ancestry, language, society, culture or nation. First Yugoslavia contains people of the Kingdom of Serbs, Croats and Slovenes (1918–29). Hence it can be said that the ethnic groups which were a part of the former Yugoslavia were Croats, Serbs, Bosnian Muslims, Macedonians. Hence option first is the correct answer. Option first; Croats, Serbs, Bosnian Muslims, Macedonians.