MGO

MGO may refer to:

Science and technology

• Magnesium oxide (chemical formula MgO)
• Methylglyoxal, an organic compound
• Marine gas oil, a fuel oil

Other uses

• Master-General of the Ordnance, British military position before 1855
• Metal Gear Online or MGO, a series of online modes throughout the Metal Gear series
  • Metal Gear Online 1, the online mode for Metal Gear Solid 3: Subsistence
    • Metal Gear Online Portable Ops, the first expansion of the mode in Metal Gear Solid: Portable Ops
    • Metal Gear Online Portable Ops Plus, the second expansion for the mode in Metal Gear Portable Ops Plus
  • Metal Gear Online 2, the online mode for Metal Gear Solid 4: Guns of the Patriots and later as Metal Gear Online
  • Metal Gear Online Peace Walker, the online mode for Metal Gear Solid: Peace walker
  • Metal Gear Online 3, the online mode for Metal Gear Solid V: The Phantom Pain