We describe four new species of Olopachys Berlese collected from litter, moss and rotting wood in north-eastern Turkey (Erzincan, Giresun and Gümüşhane Provinces) — O. transversalis sp. nov., O. ovatus sp. nov., O. elongatus sp. nov. and O. prolixus sp. nov. A key to all known species of the genus is provided.