It appears that junta directiva is often translated as "board of directors," but this is a different legal construct from what you have described. In America, the board of directors can be composed of any natural person (but this may vary by state, since in the United States, each state has its own corporate law), and need not include the manager/chief financial officer, etc. In other words, if you use "board of directors" to describe junta directiva, Americans may misinterpret the composition of the body. Because American Corporate Law appears to be distinct from what you described, you have one of two options. (1) Use "Board of Directors" but explain explicitly that Spanish law is different. Or, (2) call this body something like "Managing Board" or "Board of Management" to emphasize that it is composed of members of an organization's management. I hope this is the answer you were looking for.

The best term for 'Junta directiva' in context you have described is 'Executive Committeé' even though it can be 'Board of directors' as well. Take a look this link: http://forum.wordreference.com/showthread.php?t=1963829 Best regards.