R4, R04, R.4, R-4, or R/4 may refer to:
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- Military
- Aircraft
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R4, R04, R.4, R-4, or R/4 may refer to:
==Military== ===Aircraft=== Caudron R.4, World War I French reconnaissance aircraft, first flown in 1915 Curtiss R-4, air ambulance version of the American Curtiss Model R utility aircraft, first flown in 1915 Sikorsky R-4, American helicopter, first flown in 1942
Excerpted from Wikipedia’s “R4” article, available under the CC BY-SA 4.0 licence.