Aronian played in the Tata Steel Chess Tournament in Wijk aan Zee, Netherlands. He scored one win, three losses and nine draws, for 5½/13 points. In February 2015, he played in the Grenke Chess Classic in Baden-Baden Germany, scoring 3½/7 points. Later that month, he played in the Zurich Chess Challenge 2015, winning the Blitz tournament with 4/5 points. He scored 4/10 points in the Classical tournament, and scored 3/5 points in the Rapid tournament. He finished 4th overall in the tournament.
Aronian participated in the Grand Chess Tour, a series of three super tournaments (Norway Chess, Sinquefield Cup, and London Chess Classic) in which players try to accumulate the most Grand Chess Tour points through the three tournaments. In Norway Chess, he scored 3 points out of 9 (9th place in the tournament). On 1 September 2015, he won the 3rd Sinquefield Cup, held in Saint Louis Missouri, US, with a +3 score and wins over Fabiano Caruana, Hikaru Nakamura, and Wesley So. This result put him back up into the world's Top 10.
In October 2015, he participated in the World Rapid and Blitz Championship in Berlin, Germany. In the Rapid Championship, he placed 43rd overall, scoring 8½/15 points. In the Blitz, he placed 11th overall, scoring 13½/21 points. Aronian played in the European Chess Club Cup for Team Siberia Novosibirsk. Team Siberia, which also included Vladimir Kramnik, Alexander Grischuk, Li Chao, Wang Yue, Anton Korobov, Dmitry Kokarev, and Dmitry Bocharov, won the event. Aronian scored 5 draws out of the 5 games he played in the event.
In December 2015, Aronian played in the final leg of the Grand Chess Tour, the London Chess Classic. In this tournament, he scored 5/9, with one victory against Veselin Topalov. Overall, he scored 22 Grand Tour Points out of a maximum 39 to earn himself a spot in the top 3 of the overall Tour standings, securing an invitation in the next Grand Chess Tour.