Biogeographical interpretation of the Scleractinian fauna of the Adriatic Sea is still based on taxonomical problems and shortage of data. Using data of recent research and previous literature records, sixteen Scleractinian species were recorded and collected in the area of Kvarner Region from 62 stations. Recorded species account for about 57% of Scleractinians known in the Adriatic Sea, and for about 50% of Scleractinians known in the Mediterranean Sea. Four species are considered to be Mediterranean endemics. Heterogeneity of substrates and benthic communities is considerable in the Kvarner Region, with Scleractinians present on most different kinds of substrates and in a wide range of benthic communities. The large biodiversity of corals in the Kvarner area is strongly influenced by anthropogenic influences and the negative impact of climate change and sea warming. During the research of stone corals in the Kvarner area, intensive spread of the invasive alga Caulerpa cylindracea found Sonder at all investigated stations. The most endangered species are biocenosis of photophilous algae that lives on corals such as the solitary coral Balanophyllia europaea and the colonial species Cladodora caespitosa. The parrot fish Sparisoma cretense (Linnaeus, 1758) was found at most of the investigated stations in the southern part of Kvarner. All studied species show degrees of damage to populations related to temperature anomalies. The most endangered are the stone corals Cladocora ceaspitosa, Balanophyllia europaea, Madracis pharensis and Leptopsammia pruvoti. Polyp bleaching was also found in the species Cladocora caespitosa, Madracis pharensis and Balanophyllia europaea during the summer months of 2019. These corals have proven to be excellent indicator species on which monitoring can be carried out, as they are extremely sensitive to climatic and negative anthropogenic influences.