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{{Use dmy dates|date=February 2014}}{{Infobox swimmer
|name=
|image=Koosje van Voorn 1952.jpg
| image_size = 250px
|caption=Koosje van Voorn in 1952
|birth_date={{birth-date and age|df=yes|15 January 1935}}
|birth_place=Groningen, the Netherlands
|death_date=
|death_place=
| height =
| weight =
|sport=Swimming
|club=VZN, Groningen
|alma_mater=
| show-medals = yes
| medaltemplates ={{MedalCountry | {{NED}} }}{{MedalCompetition |Olympic Games}}{{MedalSilver| 1952 Helsinki | 4×100 m freestyle}}
}}Koosje van Voorn, (born 15 January 1935) is a retired freestyle swimmer from the Netherlands. She competed in the 100 m and 4 × 100 m relay events at the 1952 Summer Olympics and won a silver medal in the relay, alongside Marie-Louise Linssen-Vaessen, Irma Heijting-Schuhmacher and Hannie Termeulen.References{{Commons category}}{{DEFAULTSORT:Voorn, Koosje van}}{{Netherlands-Olympic-medalist-stub}}{{Netherlands-swimming-bio-stub}} 11 : 1935 births|Living people|Dutch female swimmers|Swimmers at the 1952 Summer Olympics|Olympic swimmers of the Netherlands|Olympic silver medalists for the Netherlands|Sportspeople from Groningen (city)|Medalists at the 1952 Summer Olympics|Female freestyle swimmers|Olympic silver medalists in swimming|Universiade medalists in swimming |