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O Negative refers to blood group O, Rh-negative, in the ABO and Rh blood group systems.

O Negative may also refer to:

O^-, an oxygen ion with a charge of -1
O-Negative (1998 film), a 1998 Thai film
O Negative (2015 film), a 2015 Canadian short film
Type O Negative, an American heavy metal band

This disambiguation page lists articles associated with the title O Negative.
If an internal link led you here, you may wish to change the link to point directly to the intended article.

O Negative (disambiguation)