Adelaïde Henriette "Ada" den Haan (14 May 1941 – 17 March 2023) was a Dutch breaststroke swimmer.

However, she could not participate in the 1956 Summer Olympics that were boycotted by the Netherlands in protest of the suppression of the Hungarian Revolution by the Soviet Union.

She won two European gold medals in 1958, but by 1959 her world record was broken and her dominance faded away.

She married Martien Swinkels, the coach of the Dutch swimming star Marcel Wouda.

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