Si Jiahui is a Chinese professional snooker player. After training at the Wiraka Billiard Academy in Foshan, he moved to the United Kingdom aged 16 and earned a two-year tour card through the 2019 Q School for the 2019–20 and 2020–21 seasons. He lost his tour card after ending the 2020–21 season outside the top 64 in the world rankings, and competed as an amateur during the 2021–22 season, during which he defeated Shaun Murphy 6–5 in the first round of the 2021 UK Championship. After rejoining the professional tour at the start of the 2022–23 season, he reached his first ranking quarter-final at the 2022 European Masters.