Yekaterina Aleksandrovna Kostetskaya (; born 31 December 1986) is a Russian track athlete. She came fifth in the 800 m final at the 2011 World Championships in Athletics, but was later disqualified for doping.
Kostetskaya met Australian pole vaulter Steve Hooker at the Beijing Olympics in 2008 and married him in 2012. They have three sons and live in Melbourne, Australia.
IAAF announced 28 July 2014, that Kostetskaya was sanctioned for doping after her biological passport had shown abnormalities. The two-year ban ended 20 January 2015.