The Lebnitsa (Bulgarian: Лебница) is a river in southwestern Bulgaria and southeastern North Macedonia, a right tributary of the Struma.

[2] The river takes its source on the territory of North Macedonia at an altitude of 1,480 m, at about 1.4 km southeast of the summit of Ograzhdenets (1,748 m), the highest in Ograzhden.

Near the village of Lebnitsa the river enters the Sandanski–Petrich Valley, forming an extensive alluvial cone.

[1] Its river valley is deeply incised in metamorphic rocks and granites, forming numerous meanders.

Along its left banks in Maleshevo Mountains on Bulgarian territory is situated Sokolata nature reserve, established to protect old-growth Quercus frainetto forests.