Tatyana Blokhina (née Sidorova, Russian: Татьяна Блохина, Сидорова); born 12 March 1970) is a Russian female former track and field athlete who competed for Russia and the Soviet Union in combined track and field events.

She won a gold medal at heptathlon in 1989 European Athletics Junior Championships She is a two-time Russian national champion, having won the heptathlon in 1993 and the indoor pentathlon in 1999.

[4] She represented her country at the 1993 World Championships in Athletics and the 1988 World Junior Championships in Athletics, but failed to complete all seven events on those occasions.

[5][4] Blokhina ranked third in the world for the 1993 indoor season, in which she set a career best total of 4669 points for pentathlon in Moscow.

[6] Her personal best in the heptathlon, 6703 points achieved at the 1993 Décastar, ranked her second among Europeans that season behind Germany's Sabine Braun,[7] and fourth at global level – her highest career ranking.