O15 may refer to:
- HNLMS O 15, a submarine of the Royal Netherlands Navy
- Keystone O-15, a prototype aircraft built for the United States Army Air Corps
- Oxygen-15, an isotope of oxygen
- Turlock Municipal Airport, in Merced County, California, United States
- USS O-15 (SS-76), a submarine of the United States Navy
Topics referred to by the same termThis disambiguation page lists articles associated with the same title formed as a letter–number combination.If an internal link led you here, you may wish to change the link to point directly to the intended article. Category: