Honestly, do what makes you the most comfortable. I don't have a specific policy when it comes to these situations. In some interviews, the person interviewing me has asked me about it and then it became a topic of conversation. In some of those interviews, it maybe led to me getting the job, in one particular interview it made the interviewer wary of whether or not I could perform the job (but that person ended up being a huge jerk and I quit after two months). At my current job it's never come up. I'm sure people have noticed that I stutter, but nobody has mentioned it. I don't consider stuttering to exist at the forefront of my character, so I tend to not include it in my introductions to people. Stuttering really only concerns me, so if people want to ask about it they're obviously welcome to, but it's not their problem. Sorry for diverting from your question. To reiterate my first sentence, do whatever you think will make you as comfortable as possible in the interview. If you think telling them up front that you stutter will take some pressure off, go for it. If you'd rather not mention it and wait until the topic comes up organically, also go for it. Unless the job itself requires fluent speech, there's zero reason they'd make a hiring decision based on the fact that you stutter.