OD

OD is a two-letter abbreviation and can mean any of the following:
 Order of Distinction, a civil honour of Jamaica
 Object Desktop, a suite of skinning and customization programs by Stardock, or ObjectDock, another program by the same company
 Oblivion Dust, a Japanese rock band
 On Demand, when it is available on demand
 Officer of the day
 Old Dragon, former pupil of the Dragon School
 Old Derbeian, a former pupil of Derby School
 Olive Drab, as in OD Green
 Oneness Darkness, a Texas rock band
 OpenDocument, the only ISO acknowledged standard document file format
 One Day Match, a type of shorter match in cricket
 Optical density
 Ordnance Datum, a vertical datum used in Great Britain as the basis for deriving altitudes on maps.
 Doctor of Optometry (O.D.)
 Organization development
 Orphei Drängar, a Swedish male choir
 "Ocular dextra," medical terminology meaning "right eye" ("ocular sinistra" is the term for the left eye). Abbreviated O.D. and O.S. and commonly used in ophthalmology and optometry.
 Outside diameter, a dimension commonly used to specify the size of tubing or pipe
 Od language, a language based in Pakistan.
 Overdose, related to Drugs
 OverDrive CPUs
 Odessa, TX, a small city in West Texas
 On Duty, mostly used in colleges and schools in the attendance sheets to indicate the time the student spent on other extracurricular activities (Cultural Programs etc.)
 Original dance, the second part of an ice dancing competition
 Octavian Droobers, an orienteering club.
 Oringin Destination fare, used for calculating airfares
 O.D. (musician) a founding member of the Finnish industrial band Velcra
 Official Dress in the popular agriculture club: National FFA Organization

Non abbreviated meanings of OD are as follows:
 For the Norse god Od, see Óðr
 For the life force Od, see Odic force
 For the Unix program od, see od (Unix)
 Od, a replacement for "God" in some minced oaths