F33 may refer to :
*
HMS Somali (F33), a 1937 British Royal Navy Tribal-class destroyer
*
Recurrent depressive disorder ICD-10 code
*
Hirth F-33
The Hirth F-33 is a single cylinder, two stroke, carburetted aircraft engine designed for use on ultralight aircraft, including powered paragliders and ultralight trikes. the engine is noted for its extremely light base weight of . It is ma ...
, an aircraft engine
* F-33, Another name for the
KF-21.
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