Petronella "Nel" Büch (6 December 1931, de Vos – 5 February 2013) was a Dutch sprinter.

She competed at the 1952 Summer Olympics in the 100 m and 4 × 100 m relay and finished in sixth place in the relay.

Between 1950 and 1954 she won five national titles in the 4 × 100 m relay with the team of her club Sagitta.

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