Started for a list, rules at letterboxd.com/thomasmccallum/list/letterboxd-community-top-25-film-noir-1/
This is possibly my favorite style of movie.
I have a kinda narrow idea of what counts as film noir. Gangster movies are not noir, crime movies are not noir, but there does have to be crime, so that leaves out movies like Sweet Smell of Success.
The first four are the epitome of noir, and anyone who doesn't have them in the top four spots are wrong.