This has to be one of the easiest lists of all time. It practically writes itself with one word: "China." For sure, China's proclivities for building shameless knock-offs of Western products are so well-known they're practically a punchline at this point. But believe it or not, slightly less-than-original concepts have been known to come from other places as well.
A lot of them are from Japan and Korea, whose epic knockoffs could also easily number in the hundreds. But Americans and Europeans have seen their fair share of wannabes, too. Worldwide, some blatant rip-offs like the Acura NSX, Mazda Miata, and Chrysler 300C went on to some degree of fame. And one Toyota of note quickly became a classic in its own time. Others, like the Chery QQ, have become more infamous than famous.
The lesson here: If you're going to build a blatant rip-off, at least make it better than the design you're stealing. You never know when a Ranker author is going to come along and compare cars side by side. If these similar cars look familiar, now you know why. For comparison's sake, check out this list of cars that look like other cars.
In what must be the most shameless example of brand exploitation in history, GM desperately tried to pass this Suburban in a Halloween costume off as a successor to the military-spec H1. They sold plenty of them, but that doesn't make this travesty anything more than the total poser it was.
First Generation Toyota Celica
No, that's not a 1970 Mustang Mach 1 that got shrunk in the drier - it's the 1977 Toyota Celica. Trying to break into the American market with a sports car of its own, Toyota did the smart thing and ripped the lines off of every Mustang and AMC AMX it could find. Opinions are still mixed, but most would agree the first generation Celica is still the best looking of its line.
We're trying to stay away from deliberate retro cars on this list, but the 300C absolutely needs a mention as one of the most successful retro designs ever. The 300C got its gangster lines from a gangster-era sedan called the Airflow - which is generally credited as the world's first deliberately streamlined production car.