In 2015 Season, Mazur's first competition was at the 2015 L.A. Lights where she finished 4th in the all-around. She finished 4th in all-around at the 2015 Valentine Cup and won silver in clubs, bronze in ribbon. On March 21–22, Mazur competed at the 2015 Thiais Grand Prix finishing 16th in the all-around. On March 27–29, Mazur placed 22nd in the all-around at the 2015 Lisboa World Cup. Mazur with teammates (Ganna Rizatdinova, Eleonora Romanova) competed at the 2015 European Championships where Team Ukraine won bronze. In July, Mazur finished 11th in the all-around at the 2015 Summer Universiade. In August, Mazur then competed at the 2015 Ukrainian National Championships where she won the all-around silver medal behind Ganna Rizatdinova. At the 2015 Budapest World Cup, Mazur finished 10th in all-around, her highest all-around placement for the 2015 Season. On September 9–13, Mazur (together with teammates Ganna Rizatdinova and Eleonora Romanova) competed at the 2015 World Championships in Stuttgart, with Team Ukarine taking bronze. Mazur qualified to the all-around finals finishing in 22nd place. On October 2–4, Mazur together with teammates Ganna Rizatdinova and junior Olena Diachenko represented Team Deriugins School at the 2015 Aeon Cup in Tokyo Japan, Mazur finished 9th in the individual all-around finals behind Italian Veronica Bertolini and with team Ukraine taking silver in the overall standings.