| Chaun | |
| Name Other: | Чаун |
| Map: | Chukchi Sea5CAU.png |
| Pushpin Map: | Russia Chukotka Autonomous Okrug |
| Pushpin Map Caption: | Location in the Chukotka Autonomous Okrug, Russia |
| Subdivision Type1: | Country |
| Subdivision Name1: | Russia |
| Length: | 205km (127miles) |
| Discharge1 Location: | mouth |
| Discharge1 Avg: | 90m3/s |
| Source1: | Anadyr Plateau |
| Source1 Location: | Chukotka Autonomous Okrug |
| Source1 Coordinates: | 67.5511°N 171.8083°W |
| Mouth: | Chaun Bay |
| Mouth Coordinates: | 68.9211°N 170.6497°W |
| Mouth Elevation: | 0m (00feet) |
| Basin Size: | 23000km2 |
The Chaun (Russian: Чаун) is a stream in Far East Siberia. It flows roughly northwards, passing through the sparsely populated areas of the Siberian tundra. It is long, and has a drainage basin of .
The Chaun originates in rivers flowing from the Ilirney Range and the northwestern edge of the crater of Lake Elgygytgyn (Maly Chaun). After joining they flow into the East Siberian Sea at Chaun Bay, 100km (100miles) south of the port town Pevek. The river Palyavaam discharges into a right distributary of the Chaun.[1]
Its most important tributaries are the Ugatkyn from the left side and the Milguveyem from its right side. The Chaun river gives the Chaun Bay its name. The Chaun and its tributaries belong to the Chukotka Autonomous Okrug administrative region of Russia.