Ksenia Andreyevna Ablyazina (née Semyonova) (; born 20 October 1992) is a retired Russian artistic gymnast. She is the 2007 world champion on the uneven bars, the 2008 European champion on the uneven bars and the balance beam, and the 2009 European all-around champion. She also won a gold medal with the Russian team at the 2010 World Artistic Gymnastics Championships. She represented Russia at the 2008 Summer Olympics where she finished fourth in the team competition, fourth in the all-around, and sixth in the uneven bars final.