Ekaterina Guliyeva (née Zavyalova, divorced Poistogova; born 1 March 1991) is a Russian-born track and field athlete who specializes in the 800 metres and competes for Turkey.

[1] She won the bronze medal that day in the 800 m final with a time of 1:57.53[1] behind fellow Russian Mariya Savinova (1:56.19) and Caster Semenya of South Africa (1:57.23).

In November 2015, after an investigation that completed that year, Guliyeva (along with four other Russian runners) was recommended by the World Anti-Doping Agency to receive a retroactive lifetime ban for doping during the 2012 Olympics.

[5][6] In early 2024, the Russian Athletic Federation annulled her results from July 2012 to October 2014 and banned her from competition for four years.

After marrying fellow middle-distance runner Stepan Poistogov, she adopted the feminine form of his surname, Poistogova.