The Kaljina is a river in the central-northeastern part of Bosnia and Herzegovina, municipality of Sokolac.

The source of the river is on Ozren Sarajevski, in the area of "Vrela" near Ozren village, while the majority of its course runs across Nišići karst plateau, where the river passes through a village with a same name, Kaljina, which is the largest settlement on its course.

After about 26 kilometers of scenic flow from source to confluence, through the pristine nature of the plateau, the Kaljina meets Bioštica near the town of Olovo.

The rich pool of indigenous salmonids such as Danube brown trout (Salo truta fario, Danube lineage), spawning grounds for huchen and nase, can only be maintained through statutory protection, and preservation of the Krivaja basin streams and rivers uninterrupted flow from construction of dams.

However plans for hydropower development exist, and represent a real risk for unspoiled natural environment of the region.