Ölziibayaryn Düürenbayar or Ulziibayar Duurenbayar (; born 31 January 1994) is a Mongolian judoka.
Düürenbayar participated at the 2018 World Judo Championships, where he defeated the strongest judokas such as the reigning Olympic Champion Lukáš Krpálek (waza-ari in the golden score round), 2016 Olympic silver medalist Hisayoshi Harasawa (ippon), and winning a bronze medal in the +100 kg division.
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