Deniz Ertan

 Deniz Ertan (born 1 January 2004) is a Turkish swimmer specialized in freestyle swimming. She qualified for the 800 m freestyle event of the 2020 Summer Olympics. She also came thirrd in the 800 m freestyle at the European Aquatics Championships on 18 June 2024. She is a member of Fenerbahçe Swimming.

While living in Ankara, Turkey, Ertan attended TED Ankara College. She won the bronze medal in the 200m individual medley event at the 2019 European Youth Summer Olympic Festival in Baku, Azerbaijan. After graduating in 2022, her collegiate swimming career began at Georgia Tech, swimming under head coach Courtney Shealy Hart. From September 2023, she started swimming for coach Bob Bowman at Arizona State.

She won the bronze medal with 8:34.31 in the 800 m freestyle event at the 2024 European Aquatics Championships in Belgrade, Serbia on 18 June 2024.