The Taz (Russian: Таз) is a river located in western Siberia, has a length of 1,401 kilometers (871 mi) and drains a basin estimated at 150,000 square kilometers (58,000 sq mi).

[1] Its middle and lower course are located within Yamalo-Nenets Autonomous Okrug, while its upper course borders with Krasnoyarsk Krai.

It flows roughly northwestwards across largely uninhabited areas.

Its mouth is in the Taz Estuary, a roughly 250-kilometer (160 mi) long estuary that begins in the area of the settlement of Tazovsky and ends in the Gulf of Ob.

[2] Its major tributaries include the Bolshaya Shirta and Khudosey from the right and the Tolka and Chaselka from the left.