O14 is a set of model railway standards.
O14 may also refer to:
- O-14 (Dubai), a skyscraper in the United Arab Emirates
 - Douglas O-14, an aircraft
 - HNLMS O 14, a submarine of the Royal Netherlands Navy
 - Oxygen-14, an isotope of oxygen
 - USS O-14 (SS-75), a submarine of the United States Navy
 
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