HGO
HGO means:
- Hidalgo , Mexican state, see license plate (Mexico)
- Hessian municipal code
- Herbartgymnasium Oldenburg
- HGO InfraSea Solutions
- HGO , rules of procedure for the main customs offices (DE, outdated. Successor since 2008: GO-ÖB )
HgO is:
- the chemical symbol for mercury (II) oxide
