Germaan - Dutch motorcycles
Gambler - American Harley Davidson replicas
Greeves - British Trial-bike manufacturer, they produced bikes till 1978
Greyhound - British motorcycles
Gazelle - Dutch motorcycles built in the 50s
GD - Built in Italy between 1923 - 1942by Ghirardi and Dallolio.
Gearless -Motrocycles built in America by The Gearless Motorcycle Co.
Geco-Herstal - Bikes built in Belguim and France
Gem MiniMoto - minimoto motorcycles built in England
Grindlay Peerless - English bikes from 1934
Geneva - ancient motorcycle built in 1896 in the USA, by the Geneva Bicycle and Steam Carriage Co.
Garelli (Agrati-Garelli) -they built small cc motorcycles in 1913 in Italy.
Gerkinet - French motorcycles
Gerosa - Italian bikes
Glas-Goggo - Small capacity motorcycles built in Germany, some with sidecars
Ghezzi & Brian - motorcycles built around Moto Guzzi engines in Italy, in 1995 by Giuseppe Ghezzi and Bruno Saturno
Giggle - small foldable scooters ( both electric and fossil powered), built in Taiwan
Gilera - motorcycles built in Italy sice 1909, nowadays a forerunner in the 125cc world motorcycle Championship
Gillet-Herstal - Belgian bikes
GM - Itaian Speedway and ice-racer manufacturer,Giuseppe Marzotto
Gnome Rhone - French motorcycles
Godden - Speedway motorbikes
Goericke - Germanbike built in about 1940
Gough - bicycle builders turne motorcycle manufacturers in England, in 1901
GrcMoto - Italian minimoto motorcycles
Griffon - French motorcycles from 1904. Notorious for winning the first international motorcycle race in that same year.
Gitan - small capacity motorcycles built in Italy between 1950 - 1980
Gripen - Swedish motorcycle make