Anastasiia Sergeevna Demurchian (, born 13 June 2004) is a Russian amateur boxer of Armenian origin. 2022 Russian national champion. 2023 World champion. International master of sport in boxing.
She was born and raised in Anapa, Krasnodar Krai, Russia, into an Armenian and Russian family.
In 2022, she won senior Russian nationals. In March 2023, she became a world champion in the light middleweight division (70 kg), in the final match she beat Australian Kaye Scott. In November 2023, she won the silver medal at the Russian championships held in Ufa, Bashkortostan. One year later, Anastasiia was runner-up at the national championships in the middleweight division.