Ku Yeon-woo (born 15 March 2003) is a South Korean tennis player. She has a career-high singles ranking of world No. 195, achieved on 1 December 2025, and a best doubles ranking of No. 372, reached on 6 October 2025, by the WTA. She is the current No. 1 Korean singles player.
Ku made her WTA Tour main-draw singles debut at the 2023 Korea Open as a qualifier, losing in the first round to Claire Liu.
She received a wildcard entry into the main-draw at the 2025 Korea Open, but again lost in the first round, this time to Loïs Boisson.