At the 2015 European Artistic Gymnastics Championships, Steingruber won the all-around title ahead of Maria Kharenkova of Russia and Ellie Downie of Great Britain, with a score of 57.873, becoming the first Swiss gymnast to ever win the European All-Around title. However, she failed to defend her vault title, and was beaten by the 2012 Olympic vault bronze medalist Maria Paseka; Steingruber won the silver medal with a score of 15.149. She also qualified to the uneven bars final and placed 6th with a score of 13.766. Steingruber qualified first to the floor final and ended up winning the bronze medal with a score of 14.466 behind silver medalist Claudia Fragapane of Great Britain and gold medalist Ksenia Afanasyeva of Russia. Steingruber's three medals made her the most decorated gymnast from these championships.