Jamtsyn Davaajav (Mongolian: Жамцын Даваажав; 28 June 1953 – 2000) was a Mongolian welterweight wrestler.

He competed at the 1976 Olympics in Greco-Roman and at the 1980 Olympics in freestyle wrestling and won a silver medal in 1980.

In freestyle wrestling he also won a bronze medal at the 1978 Asian Games and placed fourth at the 1977 and 1979 world championships.

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