In 2015, Filiou began the season competing at the 2015 Moscow Grand Prix finishing 22nd in the all-around. On March 21–22, Filiou competed at the 2015 Thiais Grand Prix finishing 11th in the all-around behind Canada's Patricia Bezzoubenko. On April 10–12, Filiou finished 15th in the all-around at the 2015 Pesaro World Cup. Filiou competed at the 2015 Holon Grand Prix finishing 17th in all-around. On June 15–21, Filiou competed at the inaugural 2015 European Games where she finished 14th in the all-around. In August, Filiou finished 17th in the all-around at the 2015 Sofia World Cup. At the 2015 World Cup Final in Kazan, Filiou finished 13th in the all-around and qualified to ribbon finals finishing in 6th place. On September 9–13, Filiou competed at the 2015 World Championships in Stuttgart where she qualified to 1 apparatus final finishing 8th in ribbon (17.633). In the All-around finals, Filiou finished in 14th place with a total of 69.449 points.