For the 2011–12 season, Riazanova/Tkachenko were assigned to 2011 Skate Canada and 2011 Cup of Russia as their Grand Prix events. On their free dance, which was choreographed by Sergei Petukhov, Riazanova said, "A young woman remembers her beloved, who is no longer alive. She is so deeply immersed in the memories of happy times that her dreams seem to become reality for a short while." They had to withdraw from 2011 Nebelhorn Trophy because Tkachenko's new passport was not ready. On 13 December 2011, Riazanova sustained a concussion and a broken nose when Tkachenko accidentally elbowed her in practice; she was released from hospital at her own risk on 20 December. At the Russian Championships which began on 25 December, Riazanova/Tkachenko won the bronze medal after placing third in the short dance and fourth in the free dance. They finished 5th overall at the 2012 European Championships but received a small bronze medal for their 3rd place in the short dance. They finished 9th at the 2012 World Championships.