| Tsagandelta Temporal range: Late Cretaceous,
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|---|---|
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| Preserved left dentary in lateral view, holotype PSS-MAE 629 | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Mammalia |
| Order: | †Deltatheroida |
| Family: | †Deltatheridiidae |
| Genus: | †Tsagandelta Rougier et al. 2015 |
| Species: | †T. dashzevegi
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| Binomial name | |
| †Tsagandelta dashzevegi Rougier et al. 2015
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Tsagandelta (meaning "white crest") is a genus of deltatheroidean therian mammal that lived in Asia during the Late Cretaceous. Distantly related to modern marsupials, it is part of Deltatheroida, a lineage of carnivorous metatherians common in the Cretaceous of Asia and among the most successful non-theropod carnivores of the region. It represents the first known mammal from the Bayan Shireh Formation.