Anna Ntountounaki (, born 9 September 1995) is a Greek swimmer. She competed in the women's 100 metre butterfly event at the 2016 Summer Olympics. She finished 17th in the heats with a time of 58.27 seconds which was a new national record. She did not qualify for the semifinals. At the 2020 Summer Olympics she finished 9th, achieving a new national record with a time of 57.25 seconds. Also, she won the gold of 2020 European Aquatics Championships sharing this title with Marie Wattel.