In this paper, we report for the first time two spider species for Albania, four for Bulgaria and two for Greece: Altella lucida (Simon, 1874) (Bulgaria), Eresus moravicus Rezác, 2008 (Bulgaria and Greece), Filistata insidiatrix (Forsskål, 1775) (Albania), Harpactea samuili Lazarov, 2006 (Greece), Loxosceles rufescens (Dufour, 1820) (Albania), Pritha parva Legittimo, Simeon, Di Pompeo et Kulczycki, 2017 (Bulgaria) and Pritha vestita (Simon, 1873) (Bulgaria). The recently described species P. parva is the first report for the Balkan Peninsula, while P. vestita is the first record for mainland Europe. Their congener Pritha nana (Simon, 1868) is removed from the Bulgarian checklist of spiders (misidentification). As a result of our report, the number of spider species increases to 571, 1049 and 1183 in Albania, Bulgaria and Greece, respectively. [ABSTRACT FROM AUTHOR]