Katja Fain (born 31 August 2001) is a Slovenian swimmer.

[1] She represented Slovenia at the 2019 World Aquatics Championships held in Gwangju, South Korea.

[2][3] In the 200 metre event she did not advance to compete in the semi-finals and in the 400 metre event she did not advance to compete in the final.

[2][3] She also competed in the women's 400 metre individual medley event.

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