Huda luknja, Archaeological cave system in Mislinja Municipality, Slovenia.

Huda luknja is a cave above the gorge of the Paka river near Gornji Dolič, part of a system carved by the Ponikva stream. It has two main passages: the lower Vodni rov, where the Ponikva still flows, and the dry upper Medvedov rov. The main entrance lies at the foot of the Tisnik hill.

Archaeological work in the area around Huda luknja, especially in the Špehovka cave, uncovered Stone Age stone tools. A layer with archaeological finds was also identified inside Huda luknja, but it has not yet been dated. On the strength of these finds the cave was declared a monument of local significance.

The cave lies within the protected natural reserve Huda luknja, Špehovka, Pilanca, which covers the gorge and its three caves. Archaeological work in the area, especially in Špehovka Cave, yielded Stone Age stone tools; a layer found in Huda luknja has not yet been dated. On that basis the cave was declared a monument of local significance.

The main entrance lies at the foot of Tisnik hill above the Paka gorge near Gornji Dolič. The lower Vodni rov carries the Ponikva stream and is active, while the upper Medvedov rov is dry. A second entrance, the Ponikva ponor, is accessible only a few tens of metres down. The Lisičnica cave connects to the system through a siphon.

The Huda luknja system reaches a total length of 2339 m, making it the largest cave system in northeastern Slovenia. Its upper Medvedov rov is dry, while the lower Vodni rov carries the Ponikva stream. Above the Ponikva sinkhole lies the entrance to Lisičnica cave, linked to Huda luknja through a siphon.