.223 may refer to:
- .223 Remington cartridge
- .223 MINISAS, a cartridge for close-quarter battle use
- .223 Winchester Super Short Magnum, a cartridge based on the Winchester Short Magnum case
- .223 Wylde chamber, a hybrid rifle chamber designed to allow .22 caliber barrels to safely fire either .223 Remington or 5.56×45mm NATO ammunition
See also
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