During a two year long faunistic survey in three localities in central Istria (Pazin, Vela Traba and Limska Draga), a total of 35 longhorn beetle (Coleoptera, Cerambycidae) species were recorded. This represents 16% of species in the Croatian longhorn beetle fauna. Though small in number, the species recorded in the research contribute to a better knowledge of the distribution of longhorn beetle species in Croatia. Two species, Ergates faber (Linnaeus, 1761) and Prionus coriarius (Linnaeus, 1758) were recorded for the first time in Istria. Faunistically the most interesting is the finding of the endangered species in the European scale, Morimus asper funereus Mulsant 1862, which is listed in Appendix II of the Bern convention.