Lee Hye-jin ( or , born ) is a South Korean track cyclist.
At the 2012 Summer Olympics, she competed in the women's sprint, women's keirin, and women's team sprint.
She was eighth at the 2016 Summer Olympics in keirin.
Lee won the silver medal in the women's keirin at the 2018 Asian Games.
At the 2020 Summer Olympics, she again competed in the women's keirin and women's sprint. She won a silver medal in the women's keirin at the 2020 World Championships, the best result ever for a Korean cyclist. With this result, she became the world number 1 in women's keirin.
Alongside Hwang Hyeon-seo, Kim Ha-eun, Cho Sun-yong, Lee was part of the women's sprint team that won the silver medal at the 2022 Asian Games.