The Dzherman (Bulgarian: Джерман) is a river in south-western Bulgaria, a left tributary of the Struma, flowing through the municipalities of Sapareva Banya, Dupnitsa and Boboshevo in Kyustendil Province.

The river is mentioned with name Germanshitsa in the 1378 Rila Charter of the Bulgarian emperor Ivan Shishman (r. 1371–1395), which was later modified to Dzherman during the Ottoman rule.

Within Rila, the river flows in a heavily forested deep glacial valley with a number of rapids and waterfalls.

After the town of Dupnitsa, the Dzherman, fed by its numerous tributaries mainly from the northwestern slopes of Rila, becomes larger, turns to the south-southwest and its valley widens significantly.

[2] A section of the railway between Sofia and Kulata follows the left banks of the river between Dupnitsa and Boboshevo.