G40, G-40 or G.40 may refer to:
In transportation
G40 Shanghai–Xi'an Expressway in China
a model of the Volkswagen Polo automobile
In military
Gloster E.28/39, also known as the Gloster G.40, a United Kingdom jet developed during World War II
HMS Acasta (G40), a United Kingdom Royal Navy destroyer
SMS G40, an Imperial German Navy torpedo boat

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