| Tsogto Badmazhapov | |
| Native Name: | Цогто Бадмажапов |
| Occupation: | Explorer, Mongolist, diplomat, translator, noncomissioned officer |
| Birth Date: | 1879 |
| Death Date: | 15 December 1937 |
| Birth Place: | Glagolcheskaya, Troitskosavsk, Russian Empire (now Kyakhta, Republic of Buryatia, Russia) |
| Death Place: | Novosibirsk, Novosibirsk Oblast, RSFSR. USSR |
| Years Active: | (1899-1914) (1914-1931) |
| Awards: | Lesser silver medal of the Russian Geographical Society |
Tsogto Garmayevich Badmazhapov (; 1879-1937) was a Russian translator, Mongolist, and discoverer of the city of Khara-Khoto.
An ethnic Buryat, he was a native of Troitskosavsk in the Zabaykalskoy Oblast of the Russian Empire from the Cossack estate of Kyakhta. In his capacity as a translator and explorer with the rank of senior warden (uryadnik) he participated in the Mongolo-Kamskoy Expedition of Pyotr Kozlov (1899-1901). He worked for a trading company based at Kyakhta, "Sobennikov and Molchanov Brothers" under Bazar Baradin. He was executed in 1937 on charges of participating in a counter-revolutionary conspiracy against the Mongolian People's Republic.
Badmazhapov's home in Urga is now the Historical Museum of Ulan-Bator.