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The Mongolian death worm ( , olgoi-khorkhoi, "large intestine worm") is a creature alleged to exist in the Gobi Desert.

The creature first came to Western attention as a result of Roy Chapman Andrews's 1926 book On the Trail of Ancient Man. The American paleontologist described second-hand tales of the monster that he heard at a gathering of Mongolian officials: "None of those present ever had seen the creature, but they all firmly believed in its existence and described it minutely."

In 1983 a specimen of Tartar sand boa (Eryx tataricus) was shown to locals who claimed to have seen "olgoi-khorkhoi" and they confirmed that this was the same animal.

In On the Trail of Ancient Man, Andrews cites Mongolian Prime Minister Damdinbazar, who in 1922 described the worm:

Mongolian Death Worm has not been a contender in any CBUB matches.