Hans Moke Niemann is an American chess grandmaster and Twitch streamer. He became a FIDE Grandmaster on January 22, 2021. In July 2021, he won the World Open chess tournament in Philadelphia. He first entered the Top 100 Junior players list at position 88 on March 1, 2019, and as of September 2023, he was the eighth-highest-rated Junior in the world. His peak global ranking was No. 31, in May 2023.

During the Sinquefield Cup in September 2022, a controversy arose involving the chess grandmasters Magnus Carlsen, then world champion, and Hans Niemann. Carlsen, after surprisingly losing in their third-round matchup, dropped out of the tournament. Many interpreted his withdrawal as Carlsen tacitly accusing Niemann of having cheated. In their next tournament meetup, an online tournament, Carlsen abruptly resigned after one move, perplexing observers again. It became the most serious scandal about cheating allegations in chess in years, and it garnered significant attention in the news media worldwide.