| Official Name: | Zaisan |
| Native Name: | Зайсан |
| Pushpin Map: | Kazakhstan |
| Subdivision Type: | Country |
| Subdivision Type1: | Region |
| Subdivision Name: |  Kazakhstan |
| Subdivision Name1: | East Kazakhstan Region |
| Established Title: | Founded: Established: |
| Established Date: | 1868 1941 |
| Population As Of: | 2009 |
| Population Total: | 14389 |
| Timezone: | OMST |
| Utc Offset: | +6 |
| Timezone Dst: | OMSST |
| Utc Offset Dst: | +7 |
| Coordinates: | 47.4667°N 84.8667°W |
| Elevation M: | 660 |
| Elevation Ft: | 2170 |
Zaisan or Zaysan (Kazakh: Зайсан, Zaisan; Russian: Зайсан), is a town in the East Kazakhstan Region of Kazakhstan, the administrative center of Zaisan District. It is situated near the southeastern corner of Lake Zaysan at an altitude of 660 meters (2170 ft) above sea level.[1] Population: The town is located near the eastern terminus of European route E127, which connects it with Omsk in Russia as well as the rest of the European route network.
Zaisan was founded in 1868 as a Russian military post.[2]
Zaisan has a hot-summer humid continental climate (Köppen climate classification Dfa).