G
- Galen Institute - health care think tank named after Galen, a prominent Greek physician
- Galles Racing – Rick Galles
- Galmer – Rick GALles and Alan MERtens
- Gannett Company – Frank Gannett
- Garmin – GARy Burrell and Dr. MIN Kao
- Gartner – Gideon Gartner
- Garry Rogers Motorsport – Garry Rogers
- Gatti's Pizza – Pat Eure, née Gatti, wife of company founder Jim Eure
- Gemballa – Uwe Gemballa
- Getty Images – Mark Getty
- Getty Oil – John Paul Getty
- Ghirardelli Chocolate Company – Domingo Ghirardelli
- Giannini – Tranquillo Giannini
- Gibson Guitar Corporation – Orville Gibson
- Gibson Motor Sport – Fred Gibson
- Gilbarco – Charles Gilbert and John Barker (GILbert & BARker Manufacturing CO.)
- Gilera – Giuseppe Gilera
- Gillet – Tony Gillet
- Gillette – King C. Gillette
- Girard-Perregaux – Constant Girard and Marie Perregaux
- Gitzo – Arsène Gitzhoven
- Givenchy – Hubert de Givenchy
- Glenn L. Martin Company (to Lockheed Martin) – Glenn Luther Martin
- Glenn Seton Racing – Glenn Seton
- Glock Ges.m.b.H. – Gaston Glock
- GN – H.R. Godfrey and Archibald Frazer Nash
- Godin – Robert Godin
- Goldman Sachs – Marcus Goldman and Samuel Sachs
- Goldwyn Picture Corporation – Samuel GOLDfish, Edgar and Archibald SelWYN
- Goodrich Corporation – Benjamin Goodrich
- Goodyear Tire and Rubber Company – Charles Goodyear
- Gottlieb – David Gottlieb
- Gresini Racing – Fausto Gresini
- Gretsch – Friedrich Gretsch
- GT Bicycles – Gary Turner
- Gucci – Guccio Gucci
- Guinness – Arthur Guinness
- Gumpert – Roland Gumpert
Read more about this topic: List Of Companies Named After People