Antonina Yefremova (born 19 July 1981) is a Ukrainian sprinter who specializes in the 400 metres.

Yefremova received a two-year ban in 2012 for using testosterone at the 2011 World Athletics Championships.

[3] In the 4 x 400 metres relay she finished fifth at the 2002 World Cup,[4] fifth at the 2003 World Indoor Championships,[5] fourth at the 2005 European Indoor Championships,[6] fifth at the 2005 World Championships,[7] won a bronze medal at the 2005 Summer Universiade,[8] and won a gold medal at the 2007 Summer Universiade.

[12] Her personal best times are 50.70 seconds in the 400 metres, achieved in June 2002 in Annecy, and 24.35 in the 200 metres (indoor), achieved in February 2005 in Sumy.

[13] She failed a random drug test in June 2012 and was banned for two years.