Nadiya Volodymyrivna Tkachenko (Ukrainian: Надія Володимирівна Ткаченко) or Nadezhda Vladimirovna Tkachenko (Russian: Надежда Владимировна Ткаченко) (born 19 September 1948) is a Ukrainian former pentathlete who won gold at the 1980 Olympics.

[1][2] She was born in Kremenchuk, then in the Ukrainian SSR in the Soviet Union,[1] and took up pentathlon aged 18 training at the Vanguard Voluntary Sports Societies of the Soviet Union in Donetsk Oblast.

[4][5] In May 1980, just after the ban, she scored 4880 points, which was not ratified as a record because the races were hand timed.

[1] The Soviet government awarded her the Order of the Red Banner of Labour and the title Honored Master of Sports of the USSR.

[2] Since retiring from competition she has worked as a youth sports coach in Donetsk, of which she was named an honorary citizen in 2005.