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

The now ruined city of Mangazeya was located by the Taz.

The Taz begins near Lake Dynda, Siberian Uvaly, a hilly area of the West Siberian Plain. 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. A portage connects the Taz with the Turukhan and the Yenisey. There are numerous lakes in its basin, such as the Chyortovo.

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

• List of rivers of Russia
• Upper Taz Nature Reserve

• Media related to Taz River at Wikimedia Commons
• Flooding
• Pictures taken by Landsat showing areas in western Siberia allegedly changing owing to global warming
• Ethnographic data of the Taz River area
• Bears in the Taz River area