In this article, we explore ethnic group boundaries within a context of contemporary Istria. It is maintained that the local population of Istria has a strong regional identity and that boundaries between the members of local Croat majority and the researched minority and immigrant groups are characterised by blurred group boundaries. It is argued that these people are engaged in multiple forms of boundary making which challenge the ethno-national understanding of entitlement to the in-group membership in a local imagined community. Among other things, it is indicated in the article that ethnic minority groups, such as Italians in Istria, who make a large effort in boundary making to maintain their cultural heritage, are preferred by the ethnic majority as full-fledged members of the local community than certain groups of co-ethnics. The study is based on extensive qualitative data material gathered in Croatia in the period 2009–2013. The ethnographic material comprises 45 interviews with domicile ethnic Croats, domicile members of the Italian minority and Bosnian–Herzegovinian migrants residing in Croatia and Istria.