The Natural History Museum (Mongolian: Байгалийн түүхийн музей, romanized: Baigaliin tüükhiin muzyei) is a repository and research institution located in Chingeltei, Ulaanbaatar, Mongolia.

The museum includes Departments of Geology, Geography, Flora and Fauna, Paleontology, and Anthropology encompassing the natural history of Mongolia.

The museum is particularly well known for its dinosaur and other paleontological exhibits, among which the most notable are a nearly complete skeleton of a late Cretaceous Tarbosaurus tyrannosaurid and broadly contemporaneous nests of Protoceratops eggs.

Authorities deemed the museum's 1953 building to be highly susceptible to natural disasters such as earthquakes in a study made in 2013.

[2] The museum building fell into disrepair in the following years, and was eventually demolished, despite public anger at night around 2 a.m. on 7 December 2019.