The word Deaf is used as both a noun and an adjective (which is never pluralized).  But I think that your best guide is to ask yourself if you have ever seen the word "deafs" used.  No one has.  So the answer is that the plural is "deaf".

George Veronis

On Aug 20, 2011, at 4:43 AM, Ingvild Roald wrote:

What is the English plural of 'Deaf'? Am working on a presentation of Deaf literacy, and need to be correct. Thanks,