Ekaterina Illarionovna Kalinchuk (née Dyomina; Russian: Екатерина Илларионовна Калинчук (Дёмина-); 2 December 1922 – 13 July 1997) was a Soviet gymnast.

She competed at the 1952 Summer Olympics in Helsinki, where she was a non-scoring member of the gold-winning Soviet team.

Individually she won a gold medal in the vault and a silver in the now-discontinued team portable apparatus event.

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