Postojna (pronounced [pɔˈstoːi̯na] ⓘ; German: Adelsberg,[2] Italian: Postumia) is a town in the traditional region of Inner Carniola, 35 kilometers (22 mi) from Trieste, in southwestern Slovenia.

[3] It includes the hamlet of Ravbarkomanda (sometimes also spelled Ravberkomanda, German: Räubercommando)[2] to the northeast.

The area is known to have been populated since the paleolithic era due to the discovery of a cave settlement near the town of Postojna called Betal Rock Shelter (Betalov spodmol).

[3] From the late Middle Ages, it was part of the Duchy of Carniola and hence of the Habsburg monarchy.

The parish church in the town is dedicated to Saint Stephen and belongs to the Koper Diocese.