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, a series of online modes throughout the Metal Gear series
 * Metal Gear Online 1, the online mode for Metal Gear Solid 3: Subsistence and its expansion in Metal Gear Solid: Portable Ops
 * 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 3, the online mode for Metal Gear Solid V: The Phantom Pain

MGO