The movie database IMDB has quite a lot of movies tagged with 'stuttering', 'stammer' etc. This is a selection.
The table is sorted on category and English title where category can be
feature movie / documentary / tv movie / tv series / short movie / video.
Not all movies are verified there is a PWS in it, the PWS column shows the number of PWS.
Stamily has a project 'Stuttering in Movies' that investigates how stuttering characters are portrayed in movies;

for more information, please contact StuttMov@gmail.com

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technical issue: apparently it can take up to a minute for the table to load depending on your browser