Sainjargalyn Nyam-Ochir (, born 20 July 1986) is a retired Mongolian judoka. In 2012, he won bronze at the 2012 Summer Olympics in the 73 kg category. He beat Christopher Völk in his first match, then Volodymyr Soroka before being beaten by Mansur Isaev in the quarterfinals. Because Isaev reached the final, Nyam-Ochir was entered into the repechage, where he beat Nicholas Delpopolo on the way to beating Dex Elmont in their bronze medal match.
, Nyam-Ochir was a coach at Eastside Dojo in Plano, Texas.