Llanishta Fortress (Albanian: Kalaja e Llanishtës) is a fortress in Kosovo.

In an elevated region approximately 1 kilometer to the south of Kaçanik and at an altitude of 684 meters above sea level, lies the remains of a fort. This ancient structure is characterized by a wall that is roughly 1.7 metres (5 ft 7 in) thick and stands at a relative height of 2.5–3 metres (8 ft 2 in – 9 ft 10 in) (still preserved). The wall is constructed using unhewn field stones, which are connected together with lime mortar. It is worth noting that this wall is built directly upon the natural rock foundation.

As you ascend the hill, the wall continues to be visible for a distance of approximately 50-60 meters, aligning itself with the contours of the hill's topography (isohyps). Moreover, it establishes a connection with the village of Llanishta via a gentle passageway.

• List of fortifications in Kosovo