Volkswagen Beetle was a type of car, powered by an internal combustion engine, produced on Earth by the German automotive manufacturer Volkswagen in the 20th century for civilian purposes. This car was imported into the United States.
An example of this vehicle was in 1968 seen parked on East 68th Street, in New York City. (TOS: "Assignment: Earth")
Another Beetle was seen in 1986 seen making a left turn onto Columbus Avenue from Kearny Street, in San Francisco. This was a convertible with a personalized license plate. (Star Trek IV: The Voyage Home)
By 2268, the the Ekosians had an automobile that was identical to a Volkswagen Beetle, which was commonly seen on the streets of the planet Ekos, and it was shown in a publicly broadcast newsreel. (TOS: "Patterns of Force")
The militarized World War II version of the Beetle, the Volkswagen Kübelwagen (for which the in 1938 started Beetle production was suspended after the outbreak of World War II), has, aside from "Patterns of Force", also been featured in the Star Trek: Enterprise fourth season episode "Storm Front".