- Geological Survey of India1
- Geological Survey of Western Australia1
- Geological and Natural History Survey of Minnesota1
- George Philip & Son1
- Georgia Public Service Commission1
- Gibbon, Lardner1
- Gibson, Arthur1
- Gibson, J. (John), active 1750-17921
- Gies & Co.1
- Giesecke & Devrient1
- Gilbert, B. D.1
- Gilbert, Grove Karl, 1843-19181
- Gilpin, George1
- Giraldon-Bovinet.1
- Glassbach, Christian Benjamin, 1724-17791
- Gleditsch, K.G1
- Gleditsch, Kristen Gran, 1867-19461
- Glu?mer, Bodo von1
- Godwin-Austen, Henry Haversham, 1834-19231
- Goldbaum, David, 1858-19301