| Kizir | |
| Mouth: | Kazyr |
| Mouth Coordinates: | 53.8485°N 93.1054°W |
| Progression: | Kazyr→ Tuba→ |
| Subdivision Type1: | Country |
| Subdivision Name1: | Russia |
| Length: | 300km (200miles) |
| Basin Size: | 9170km2 |
The Kizir (Russian: Кизир) is a right tributary of the Kazyr. It flows through the Eastern Sayan Mountains in the Krasnoyarsk Krai of Russia. Its source is located in the Kryzhin Range. It is long, and has a drainage basin of . The river contains many cataracts which make it popular with Siberian rafters. Another tourist attraction is the Kinzelyuk Waterfall, one of the highest in Asia.