| 释义 |
- References
{{Use dmy dates|date=August 2015}}{{Infobox sportsperson
|name=
|image=Joseph Callens 1922.jpg
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|caption=Joseph Callens in 1922
|birth_date=20 March 1894
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|sport=Swimming, diving
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| show-medals = yes
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}}Renni Joseph Callens was a Belgian freestyle swimmer and diver. He competed at the 1920 Summer Olympics in the 3 meter springboard and at the 1924 Summer Olympics in the 4×200 m freestyle relay, but failed to reach the finals.References{{Commons category|Joseph Callens}}{{DEFAULTSORT:Callens, Joseph}} 10 : 1894 births|Date of death unknown|Male freestyle swimmers|Divers at the 1924 Summer Olympics|Swimmers at the 1924 Summer Olympics|Belgian male swimmers|Belgian male divers|Olympic swimmers of Belgium|Olympic divers of Belgium|Place of birth missing |