Traditional Brie De Meaux is one type of brie that you won't find in America. Only the pasteurized version is available here, and it's not as good.
There are cheese mites in Mimolette that are removed from the cheese, but cheese makers aren't overly careful to remove all mites. So, the FDA decided to make this cheese illegal.
This delicious type of cheese is banned in the U.S. because it's typically made with raw milk so it's not pasteurized.
When served at room temperature, this cheese oozes everywhere. Like Brie De Meaux, only the pasteurized version is available in the U.S., and the more delicious, traditional cheese is illegal.
The secret ingredient in Casu Marzu is maggots. Yuck! They eat the cheese, and their excrement aids in fermentation, and also gives it a unique flavor. The maggots have to be alive, so maybe that's why it's illegal.
This type of cheese is banned in the U.S. unless it is aged at least 60 days. Camemberts are common in the U.S., but they are pasteurized, unlike the original.
Reblochon has been banned in the U.S. since 2004 when it was defined as a soft (rather than semi-pressed) cheese. Because of this, it falls short of the FDA requirement for aging.
This cheese isn't technically illegal. The Bush administration placed a 300% tax on this cheese to import it, so it's very difficult to get. It looks delicious though!