Yuliya Yefimova, Russian swimmer
Yuliya Andreyevna Yefimova (Russian: Юлия Андреевна Ефимова, also romanized Efimova; born 3 April 1992) is a Russian competitive swimmer. She is the Russian national record holder in the 200 metre individual medley (short course), 50 metre breaststroke (short course and long course), 100 metre breaststroke (short course and long course), and 200 metre breaststroke (short course and long course). After making her Olympic debut in 2008, she went on to win the bronze medal in the 200 metre breaststroke in 2012, and silver medals in the 100 metre and 200 metre breaststroke in 2016. She is a six-time World Champion, winning the 50 metre breaststroke in 2009 and 2013, the 100 metre breaststroke in 2015, and the 200 metre breaststroke in 2013, 2017, and 2019. She is also a former world record holder in the 50 metre breaststroke.

After failing a drug test, Yefimova was disqualified from competition for 16 months, from October 2013 to February 2015, was stripped of her results and medals at the 2013 European Short Course Championships, and four of her world short-course records were invalidated.