The focus of the study was business zones in Slovenian and Croatian Istria. The existing situation is characterised by a non-transparent situation as to the number, extent, and range of development areas. In the study, we used the comparative method to determine the existing situation and potential solutions for a more efficient role of zones in the concept of spatial development of Istria as a whole. We found that improvements in the fields of programmatic typology, data updating, and the management and marketing system were necessary. BUSINESS ZONES CROATIAN ISTRIA DEVELOPMENT DOCUMENTS SLOVENIAN ISTRIA SPATIAL CAPACITIES SPATIAL PLANS Ovaj se rad bavi istrazivanjem poslovnih zona u slovenskim i hrvatskim dijelovima Istre. Sadasnju situaciju karakterizira netransparentnost u pogledu broja, opsega i rasprostranjenosti razvojnih podrueja. Analiza je provedena usporednom metodom kako bi se utvrdila postojeca situacija i potencijalna rjesenja za efikasniju ulogu tih zona u koncepciji prostornog razvoja Istre kao cjeline. Rad pokazuje da je potrebno uvesti poboljsanja u okvirima programske tipologije, azuriranja podataka te upravljanja i marketinga. POSLOVNE ZONE HRVATSKI DIO ISTRE DOKUMENTI RAZVOJA SLOVENSKI DIO ISTRE PROSTORNI KAPACITETI PROSTORNI PLANOVI