Is there an independent oversight body of Journal Impact Factors? I have read many questions on this site that relate to Journal impact factors, for example, in relation to how that may affect where to publish etc. 

I am wondering is there an independent oversight body that regulates the area of impact factors?

I was thinking along the lines of something like the International Organization for Standardization that regulates the ISO standards across the world.

Specifically is there an independent body (either commercial or not for profit) that sets the standards for impact factors and audits them so as that one impact factor can be compared with another with the knowledge that they are calculated in the same way?
No.

Academic publishing is not regulated by any oversight body.  There is not even a universal standard for what constitutes a publication.