- Genest, Rosario1
- Gent, William1
- Geographical Publishing Co1
- Geological Survey (South Africa)1
- 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
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- Giesecke & Devrient1
- Gilbert, B. D.1
- Gilbert, Grove Karl, 1843-19181
- Gill, Kyle G.1
- Gilpin, George1
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- Glassbach, Christian Benjamin, 1724-17791