Juncus atratus Krock. of the Juncaceae family is a Central European-Southern Siberian wet-meadow species. In Central Europe, the species is very rare and threatened. In Slovenian Red Data List, it is listed among unsufficiently known species (K). The only record of the species in Slovenian territory (Prem near Ilirska Bistrica, SW Slovenia) is over 100 years old and has never been confirmed afterwards. In May 2010, the species was found in Goričko (NE Slovenia), were it thrives on a wet meadow near Kobilje village. The article discusses the recent finding of the species in Slovenia in broader context, its distribution, habitat and threat factors. The aim of the study was also to provide bases for nature-conservation of the species in Slovenia. According to recent finding and the results of the study, the authors suggest Juncus atratus to be regarded as ‘endangered’ (E) in the national red data list.