RDK may refer to:
*
Reichsbund der Kinderreichen, a defunct German Natalist group
*
Russian Volunteer Corps
The Russian Volunteer Corps (RVC; ) is a far-right paramilitary unit of Russia, Russian citizens, based in Ukraine. It was formed in August 2022, during the Russian invasion of Ukraine, to fight against the Russia under Vladimir Putin, governm ...
, a Russian nationalist paramilitary unit, fighting for the side of Ukraine. (''Russkiy dobrovolcheskiy korpus'')
* RDK, the FAA LID code for
Red Oak Municipal Airport, Iowa, United States
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