Definitely let them know. At the end of the day, it's no crime to stutter and they have no right to ever belittle or stigmatise you for it so what's the worst that can happen? If anything, my speech therapist would tell me to look at it this way that with interviewers or new people, your stutter can give one or two bonuses that if someone's going to be harsh and impatient to you then at least you know what kind of person they are to ask yourself why do you even want to be around them. When I was at uni I felt as though my tutor was obviously aware that I stutter without me disclosing it to her that she would very rarely call me on to answer a question but that's just my theory. Although it was nice to not be picked on to speak, having read many self-help books on anxiety and fear, it only becomes your comfort blanket for too long to avoid opportunities and rely on someone else to speak for you when they can't always be there. You're capable and can reach there, the stutter doesn't need to define you when you're surrounded by decent people. :)