| Named By: | T. A. Tumanova in 1993 |
| Time Period: | Late Cretaceous, 90 Ma |
| Location: | Mongolia, Bayan Shireh Formation |
| Size: | Skull about 30 centimetres long |
| Diet: | Herbivore |
| Fossil(s): | Skull |
| Classification: | | Chordata | Reptilia | Dinosauria | Ornithischia | Thyreophora | Ankylosauria | Ankylosauridae | |
Tsagantegia (meaning "of Tsagan-Teg"; Tumanova, 1993) is a genus of medium-sized ankylosaurid dinosaur from the Upper Cretaceous Mongolia, during the Cenomanian stage.
The holotype specimen (GI SPS N 700/17), a complete skull, was recovered from the Bayan Shireh Formation (Cenomanian-Santonian), at the Tsagan-Teg ("White Mountain") locality, Dzun-Bayan, in the southeastern Gobi Desert, Mongolia. The genus is monotypic, including only the type species, T. longicranialis.