I would add...
Ace in the Hole
Cape Fear
Laura
The Lineup
Mildred Pierce
The Naked City
Narrow Margin
The Postman Always Rings Twice
The Set-Up
Sweet Smell of Success
White Heat
I would replace The Lady from Shanghai with Gilda and replace Shadow of a Doubt with Strangers on a Train or Notorious (though I wouldn't count any of those Hitchcock films as Noir.)
A few of those are major oversights on my part, so expanding to 25 I'll add:
Gilda
Laura
The Naked City
Sweet Smell of Success
The Postman Always Rings Twice
Ace in the Hole - got two Wilders already
Cape Fear - even though it's on my top 100 noirs, it's a little outside what I consider the traditional "noir cycle"
The Lineup, The Set-Up, Narrow Margin - love all three, but they're not in the conversation as much as the others
Mildred Pierce, White Heat - too debatable as "true" noirs
Why can't Hitchcock be noir? Is he too good for it or something?