Hambüchen did not compete in the 2015 European Artistic Gymnastics Championships. In June, he competed at the 2015 European Games where he finished 5th in the all-around and won the gold medal on the horizontal bar individual event finals. In July, he competed at the 2015 Summer Universiade where he won the gold medal on the horizontal bar individual event final. At the 2015 World Artistic Gymnastics Championships the German team did not qualify for the team final, and therefore missed automatic qualification for the 2016 Summer Olympics. Hambüchen qualified to the all-around individual event final in 27th place but withdrew due to illness. He also qualified to the horizontal bar individual event final in 4th place, but finished in 7th after executing a poor routine.