| Tobol | |
| Pushpin Map: | Russia |
| Pushpin Map Caption: | Location of mouth |
| Source1: | Turgay Plateau |
| Source1 Location: | Kairakty, Russia |
| Source1 Elevation: | 271m (889feet) |
| Mouth: | Irtysh |
| Mouth Location: | Tobolsk, Russia |
| Mouth Coordinates: | 58.1539°N 68.2153°W |
| Mouth Elevation: | 32m (105feet) |
| River System: | Ob |
| Subdivision Type1: | Country |
| Subdivision Name1: | Russia, Kazakhstan |
| Length: | 1591km (989miles) |
| Discharge1 Avg: | 805m3/s |
| Basin Size: | 426000km2 |
| Map: | Tobol river 2 layers en.svg |
The Tobol (Russian: Тобол, Kazakh: Тобыл Tobyl, Тубыл Tubyl) is a river in Western Siberia (in Kazakhstan and Russia) and the main (left) tributary of the Irtysh. Its length is, and the area of its drainage basin is .
The Tobol River was one of the four important rivers of the Siberia Khanate. In 1428 the khan was killed in a battle with the forces of Abu'l-Khayr Khan at the Battle of Tobol.[1]
In the 16th century, the Tobol was the eastern terminus of the portage route leading westward to the rivers Vishera and Kama.
The largest tributaries of the Tobol are, from source to mouth: