Back Da-yeon (born 24 January 2002) is a Korean tennis player.

[1] Back made her WTA Tour debut at the 2022 Korea Open, after qualifying for the singles main draw.

She lost in the first round to fellow South Korean player Han Na-lae.

569 at the 2023 Korea Open where she received a wildcard, she upset second seed Jelena Ostapenko in a deciding tie-break having fought back from match point down earlier in the third set.

[7] Given a wildcard for the newly upgraded WTA 500 2024 Korea Open, she was unable to repeat her success of the previous year, going out in the first round in straight sets to qualifier Carol Zhao.