O1 1821520 220196035 2008-06-18T18:47:29Z Caerwine 347371 USS O-1 {{seealso|01}} '''O1''' or '''O-1''' may be referring to: *[[O-1 Bird Dog]], an observation aircraft manufactured by Cessna *[[Curtiss Falcon|O-1 Falcon]], an observation aircraft manufactured by the Curtiss Aircraft Company *[[O-1 Airship]], an Italian manufactured semi-rigid airship operated by the US Navy *[[USS O-1 (SS-62)|USS ''O-1'' (SS-62)]], lead ship of the United States O class submarines *[[O-1 visa]] * '''O1 star''', a subclass of O-[[stellar classification|class stars]] * Y-DNA [[Haplogroup O1 (Y-DNA)|Haplogroup O1]] * [[Otoyol 1]], [[List of highways in Turkey|Turkish highway]] around Istanbul * [[Austrian Radio Ö1 International]] <!-- Long comment to protect Special:Shortpages--> {{disambig}} [[it:O1]]