Nataliya Viktorivna Tobias (, née Sydorenko (Сидоренко); born 22 November 1980 in Serov, Soviet Union) is a female former middle-distance runner from Ukraine, who specialized in the 1500 metres. She holds personal bests of 4:01.78 minutes for the 1500 m, 2:02.31 minutes for the 800 metres, and 8:51.32 minutes for the 3000 metres. Tobias represented her country at the Olympics twice, including a 1500 m bronze medal at the 2008 Beijing Olympics. She also competed at the World Championships in Athletics in 2007 and 2011, and was the 1500 m gold medallist at the 2003 Summer Universiade. During her career, she won Ukrainian national titles in five different events. Tobias received a two-year ban in 2012 for testing positive for testosterone at the 2011 World Athletics Championships. International competitions National titles Ukrainian Athletics Championships 800 m: 2006 3000 m steeplechase: 2007 5000 m: 2003 Ukrainian Indoor Athletics Championships 1500 m: 2004, 2008, 2011 3000 m: 2003, 2011 Personal bests 800 metres - 2:02.31 min (2006) 1500 metres - 4:01.78 min (2008) 3000 metres - 8:51.32 min (2003) 5000 metres - 15:52.28 min (2003) References External links 1980 births Living people People from Serov Ukrainian female middle-distance runners Ukrainian female steeplechase runners Olympic athletes of Ukraine Olympic bronze medalists for Ukraine Olympic bronze medalists in athletics (track and field) Athletes (track and field) at the 2004 Summer Olympics Athletes (track and field) at the 2008 Summer Olympics Medalists at the 2008 Summer Olympics World Athletics Championships athletes for Ukraine Universiade medalists in athletics (track and field) Universiade gold medalists for Ukraine Doping cases in athletics Ukrainian sportspeople in doping cases Competitors at the 2001 Summer Universiade Medalists at the 2003 Summer Universiade