Natalia Trefilova (also Nataliya), born 1 July 1971, is a former freestyle swimmer from the Soviet Union.

Her effort in the 100 metre freestyle saw her finish first in the B Final in a time of 56.48 seconds.

In the 200 metre freestyle, Natalia achieved her best individual result of the meet, finishing fifth in the Championship Final in 1 minute 59.24 seconds.

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