I've never done this before but I do love a good list! Let's see how many of these I can actually watch...
QUICK EASY RULES:
There must be 31 horror films
6 countries (other than Italy or US)
- Wild Zero (Japan)
- Viy (Russia)
- The Damned (Iceland)
- The Deep Dark (France)
- Handling the Undead (Norway)
- The Phantom Carriage (Sweden)

9 decades
- phantom carriage (1920s)
- wizard of oz (1930s)
- cat people (1940s)
- Mr. Sardonicus (1960s)
- Invasion of the Body Snatchers (1970s)
- C.H.U.D (1980s)
- Fire in the Sky (1990s)
- Devil's Backbone (2000s)
- Until Dawn (2020s)

5 Zombie Films
- 28 years later
- Cemetery Man
- Dawn of the Dead
- Highway to Hell
- Day of the Dead

3 cult or conspiracy horror films
- Rosemary's Baby
- The Empty Man
- Dunwich Horror

1 film from a Black director with a Black lead
- Ganja & Hess

1 film from a Mexican or Central American director
- The Devil's Backbone

1 Canadian film
- The Shrouds

1 former Soviet state film (Armenia, Azerbaijan, Belarus, Estonia, Georgia, Kazakhstan, Kyrgyzstan, Latvia, Lithuania, Moldova, Russia, Tajikistan, Turkmenistan, Ukraine, and Uzbekistan)
- Dead Mountaineer's Hotel

The most popular film from the 1940s that you haven't seen and can access..
- Cat People

2 Post Apocalyptic horror films
- 28 years later
- Day of the Dead

1 Film with dreams or a dream as part of the plot
- Rosemary's Baby

1 The animals are pissed at us film
- The Birds

1 Silent film
- The Phantom Carriage

4 based on Novels
- Invasion of the Body Snatchers
- The Vourdulak
- Fire in the Sky
- The Haunting

Any film from THIS list that you haven't seen.
- CHUD

1 Ernesto Gastaldi written film
- crypt of the vampire

1 film from 1932
- Murders in the Rue Morgue

I have never made a specific film a part of this before, but WIZARD of OZ ('39)