Hans Moke Niemann is an American grandmaster, born in San Francisco in 2003. He moved to the Netherlands at the age of seven, where he started playing chess, and later returned to the United States, training at the U.S. Chess School. His rating rose from 2466 in 2019 to 2645 by 2021, and he became a grandmaster on 22 January 2021.

In 2021 Niemann won the World Open in Philadelphia and the U.S. Junior Championship. He went on to win several open tournaments, including the Grenke Chess Open in 2024 with 8/9. In May 2026 he won the Super Rapid & Blitz Poland in Warsaw, the first leg of the 2026 Grand Chess Tour, going undefeated through the nine rounds of the rapid section.