Yekaterina Aleksandrovna Marennikova (; born 29 April 1982) is a Russian former handball player and current coach. She is world champion and olympic medallist the Russian national team. She won gold medals at the 2005 World Championship and 2016 Olympics in Rio, placing second in 2008 and eighth in 2012.
Marennikova started her career at Tremp-Spartak Sankt Petersburg. In 2004, she joined Handball Club Lada. Here, she won the 2005, 2006, and 2008 Russian Championships and the 2012 EHF European League. In 2007, she reached the final of the EHF Champions League.
In 2012, she joined Zvezda Zvenigorod. Here, she won the 2014 Russian Cup.
In 2016, she joined HC Kuban Krasnodar for a single season, before she retired.
In 2019, she became the assistant coach at Handball Club Lada. In January 2022, she overtook the head coach position for the rest of the season. For the 2022âÂÂ23 season, she became the assistant coach of the second team. For the 2024âÂÂ25 season, she once again became the head coach at the club.
Marennikova is married to Eduard and has a son Andrei. She has a degree in physical education from the Lesgaft Institute in Saint Petersburg.