Alla Grebennikova (; born 24 February 1949) is a retired Russian breaststroke swimmer who won two medals at the 1970 European Aquatics Championships. She also competed at the 1968 Summer Olympics and finished fourth in the 4×100 m medley and 200 m breaststroke events.
She married a Bulgarian swimming coach, Georgi Kostadinov (), changed her name to Kostadinova, and moved to Bulgaria. There she worked as a swimming coach and started competing in the masters category.Спорт: Плувци-ветерани завладяха Южна Франция. velingrad.comСветовна рекордьорка обучава деца по плуване. narodnodelo.bg (2010-07-12). Since around 2000 she returned to Russia (or started sharing time between Russia and Bulgaria) and until 2008 was winning all Russian 200 m breaststroke titles. She finished second at the European (2001) and World championships (2004) in the same event.
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