| Apsat | |
| Source1: | Kodar Range, Stanovoy Highlands |
| Mouth: | Chara |
| Mouth Coordinates: | 57.0348°N 118.5528°W |
| Progression: | Chara→ Olyokma→ |
| Subdivision Type1: | Country |
| Subdivision Name1: | Russia |
| Length: | 105km (65miles) |
| Basin Size: | 1280km2 |
| Pushpin Map: | Russia Zabaykalsky Krai |
| Pushpin Map Caption: | Mouth location in Zabaykalsky Krai, Russia |
The Apsat (Russian: Апсат) is a river in the Kodar Range, on the eastern side of Lake Baikal in Siberia, Russia. It is a left tributary of the Chara (Lena basin). It is long, and has a drainage basin of .