Leiobunum gruberi nov. spec. (Arachnida, Opiliones, Phalangiidae) from northern Greece (Macedonia, Leptokaria) is described and figured. This species is closely related to Leiobunum seriatum Simon, 1878, known from the Near East, Cyprus and eastern Anatolia. A short review of known taxa of the genus Leiobunum C.L. Koch, 1839, on the Balkan is presented.