Hmm… I guess I’ll go with:
1. The Shining. I dunno it’s particularly too scary, but I would say it does horror very well.
2. Scooby Doo and the Witch’s Ghost. Very Halloween aesthetic, for sure. And the Hex Girls!
3. Frankenstein: can’t go wrong with a classic, followed with
4. Dracula. For the same reasons, heh.
5. Predator. I think it’s pretty good for an action horror movie. :0
I feel like there is more; but there isn’t many coming to mind for me.

Good question... Nope. I haven't watched any of it

I'm not sure if these are considered Halloween, but these are my top five favorite weird movies that are good to watch around Halloween.

Hocus pocus
The original War of the Worlds
Signs
Jaws
Killer Klowns from Outer Space
And as a bonus:
The Rocky Horror picture show