G40, G-40 or G.40 may refer to:
Transportation G40 Shanghai–Xi'an Expressway in China a model of the Volkswagen Polo automobile
Military Gloster E.28/39, also known as the Gloster G.40, a United Kingdom jet developed during World War II SMS G40, an Imperial German Navy torpedo boat
Other Generation 40, a Zimbabwean political faction in ZANU-PF supporting Grace Mugabe, the wife of Robert Mugabe IBM ThinkPad G40, a laptop computer