If I am accused of theft and terminated for it, is there anything I can do, especially if it is not true?

I have never stolen and the thought has never crossed my mind, but there are rumors going around that this is the case. I think I have acidentially pissed off a Manager and this is how and why it got propagated. There has not been anything done about this yet but the rumors just recently spread. I can now see everyone's reaction toward me is much different. I am worried I may be terminated or even worse, blacklisted in some way to prevent me from working in my field. I have worked to hard at my career to let someone spread lies about me. - Is this your question? Add additional information