Horror animation/cartoons?
 

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The Halloween Tree
Tales From The Crypt cartoon (Not very good if you ask me)
Then There is the Cartoon episode that Tales from the crypt did. I cant recall the name of it though.


Oh and Ren & Stimpy. (Kind of Horrific.)

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Yeah, it really sucks.

The Real Ghostbusters is amazing.

I saw a show when I was a kid, it was called "Gargoyles", I'm not sure if it' considered Horror, but I remember enjoying it.

Do Animes count?

I would say anime counts

Yeah. Anime has blood, gore, and monsters in it.

So in this case...in two weeks they show a Korean zombie anime film in our cinema, called 'Seoul Station'. Looks nice. Definitely also a watch is Dead Speace Extinction, zombie horror in the space, it's awesome. Well and there are two Resident Evil animated movies that I found actually very good. Then there is Attack on Titan, a very famous anime show about wild Titans walking around like Godzillas and eating humans, I didn't watch it but it looks actually fun.

I remember watching one that was about vampires, but, I can't for the life of me remember the title!