Helene "Leni" Junker (later Thymm; 8 December 1905 – 9 February 1997) was a German sprint runner who competed at the 1928 Summer Olympics.

She won a bronze medal in the 4 × 100 m, but failed to reach the final of the individual 100 m event.

Earlier in 1925 she set a world record in the 100-metre at 12.2 seconds.

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