A lot of people believe this but its not true:
Originally Posted by balabusta
In Judaism, one is not allowed to buried in a Jewish cemetary if they "don a tatoo" on their body unless they have a number from the concentration camp.
The Torah forbids us from tattooing our bodies. Nonetheless, one who has had tattoos can still buried in a Jewish cemetery.
That said, every Jewish burial society has the right to enact its own criteria for who may and may not be buried in their plot. This stems from people's desire (or right?) to be buried in proximity to others of their choosing. So while technically there is nothing in Jewish law which prohibits a tattooed person from being interred in a Jewish cemetery, certain burial societies -- not the majority of them or even close -- will not bury among their own a person who willingly tattooed him/herself, as it is a permanent exhibition of violation of Jewish Law.
This practice by certain burial societies led to the common misconception that this ban was an inherent part of Jewish law.