You can if you want, or you can specify if there's an option for stating in the box what it appears to be. Usually I tick 'no' then disclose it to the interviewer in person so I come across as very confident as I think to myself is stuttering really a disability? When does it become a disability? I see it as this way: As a social science graduate, if a person's on a wheelchair and there's no ramps to help them get up, are they disabled or has the society made them disabled to not be independent? Same way that is my stuttering a disability or can people just kindly ignore it and still find it easy to talk and listen to me so I don't feel ashamed for it? Entirely up to you, that's just my opinion!