The Tanjaro (Arabic: نهر تنجيرو), also spelled Tanjero, is a river in the Kurdistan Region in Iraq.

It arises near the city Sulaymaniyah through the confluence of the rivers Kiliasan and Kani-Ban and flows into the Darbandikhan Dam reservoir after 58 kilometers.

Bestansur is an archaeological site on the left bank of the river occupied during the Neolithic period.

A sherd dated to 6500-6200 cal BC with an imprint of a possible fishing net has been found there, indicating the exploitation of riverine resources.

[2] In the Darbandichan reservoir, pollution from the Tanjero periodically leads to fish kill in Summer.