Cornelis Wilhelm "Kees" Jonker (March 29, 1909 in Amsterdam – February 2, 1987 in Steinach am Brenner) was a sailor from the Netherlands, who represented his country at the 1936 Summer Olympics in Kiel. Jonker, as crew member on the Dutch 6 Metre De Ruyter, took the 8th place with helmsman Joop Carp and fellow crew members Ansco Dokkum, Ernst Moltzer, and Herman Looman.
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