Alla Grebennikova

Alla Grebennikova (Алла Гребенникова; 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 (Георги Костадинов), changed her name to Kostadinova, and moved to Bulgaria. There she worked as a swimming coach and started competing in the masters category. 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.