List of Acronyms and Initialisms: O - OG

OG

• OG:
  • Objective Glass, see Objective (optics)
  • Obstetrics and gynaecology
  • Offensive Guard, see Guard (American football)
  • Old Giggleswickian, a former pupil of Giggleswick School
  • Old Gower, a former pupil of University College School
  • Old Gregorian, a former pupil of Downside School
  • Old Greshamian, a former pupil of Gresham's School
  • Old Gold, a dark yellow
  • Olympic Games
  • Original Gangster, see Gangster
  • Original Gravity, see Gravity (beer)
  • Outpost Gallifrey, a Doctor Who fansite.
  • Own goal, in soccer, a goal scored by a player in their own side's goal
  • OG: Optimized Gaia, theory the earth optimizes itself to promote life, and popular movement to Promote Human Progress in Harmony with the Natural World.
  • OG: Original Gangster, an album by Ice-T
• OGC – (i) Open Geospatial Consortium
• OGD – (i) Other Government Department
• OGO – (i) Other Government Organization
• OGX – OUARGLA – a petroleum state in the south of Algeria