Shin Eun-soo (신은수, born October 23, 2002) is a South Korean actress. She made her acting debut in 2016 by winning the lead role alongside Gang Dong-won in the fantasy feature film Vanishing Time: A Boy Who Returned out of more than 300 auditionees. Her television and film credits include playing the younger version of Jun Ji-hyun in The Legend of the Blue Sea (2016), Bad Papa (2018)—for which she won the MBC Drama Award for Best Young Actress—Homme Fatale (2019), Do Do Sol Sol La La Sol (2020), and The Good Detective 2 (2022). She earned critical acclaim for her performance as the deaf student Yoon Chung-ah in the youth drama Twinkling Watermelon (2023) and starred in the Netflix retro romance film Love Untangled (2025).