The following is a list of ecoregions in Mongolia, according to the Worldwide Fund for Nature (WWF):
Terrestrial
Temperate coniferous forests
- Altai montane forest and forest steppe (China, Kazakhstan, Mongolia, Russia)
- Khangai Mountains conifer forests (Mongolia)
- Sayan montane conifer forests (Mongolia, Russia)
Boreal forests/taiga
Temperate grasslands, savannas and shrublands
- Daurian forest steppe (China, Mongolia, Russia)
- Mongolian–Manchurian grassland (China, Mongolia, Russia)
- Sayan Intermontane steppe (Russia, Mongolia)
- Selenge–Orkhon forest steppe (Mongolia, Russia)
Montane grasslands and shrublands
- Altai alpine meadow and tundra (China, Kazakhstan, Mongolia, Russia)
- Khangai Mountains alpine meadow (Mongolia)
- Sayan alpine meadows and tundra (Mongolia, Russia)
Deserts and xeric shrublands
- Alashan Plateau semi-desert (Mongolia, China)
- Eastern Gobi desert steppe (Mongolia, China)
- Gobi Lakes Valley desert steppe (Mongolia, China)
- Great Lakes Basin desert steppe (Mongolia, Russia)
- Junggar Basin semi-desert (China, Mongolia, Kazakhstan)
