What a positively horrible idea! I love it! I'll sticky the thread and edit this comment to track the list.

1. Rec. https://en.wikipedia.org/wiki/Rec_(film) , Spain 2007, IMDB 🇪🇸
2. Deathgasm. Wikipedia, 2015, Aotearoa, IMDB 🇳🇿
3. Titane. France, 2016. Wikipedia, IMDB 🇫🇷
4. Braindead, https://en.wikipedia.org/wiki/Braindead_(film) , 1992, Aotearoa, IMDB 🇳🇿
5. The Butcher Boy, 1997, Ireland, IMDB 🇮🇪
6. Saloum, Senegal, 2021, IMDB 🇸🇳
7. Heavenly Creatures, 1994, Aotearoa, IMDB 🇳🇿
8. Huesera: The Bone Woman, 2022, Mexico IMDB 🇲🇽
9. Pride and Prejudice and Zombies, 2016, England IMDB, Wikipedia 🏴󠁧󠁢󠁥󠁮󠁧󠁿
10. Speak No Evil, Denmark, 2022, Wikipedia 🇩🇰
11. Thirst, South Korea, 2009, Wikipedia 🇰🇷
12. The Feast, Wales, 2021 (yn y Gymraeg) 🏴󠁧󠁢󠁷󠁬󠁳󠁿
13. Romasanta IMDB, Spain, 2004
14. Calvaire (2004) - Belgium/Luxembourg
15. Living in Bondage (1992) - Nigeria
16. Juan of the Dead (2011) - Cuba
17. Adam Chaplin (2011) - Italy
18. Timecrimes (2007) - Spain
19. Martyrs (2008) - France
20. Versus (2000) - Japan
21. Body Melt (1993) - Australia
22. Living in Bondage (1992) - Nigeria
23. Tetsuo: The Iron Man (1989) - Japan
24. Gaia (2021) - South Africa
25. Knife+Heart (French: Un couteau dans le cœur), France, 2018
26. Fried Barry (2020) - South African
27. The Devil's Backbone (2001) - Spain
28. Byzantium, Ireland, 2018, IMDB
29. Thirst, 2009, South Korea, Wikipedia
30. Possession, Wikipedia, co-production between France and West Germany, available on The Pirate Bay
31. Dust Devil (1993) - South African co-production filmed in Namibia

Saloum from Senegal, 2021.

Might seem like a crime flick for the first half, but I think it qualifies as a horror in the 2nd half.

https://en.wikipedia.org/wiki/Speak_No_Evil_(2022_film)

Danish one that won awards. It's on þe Corsair Cove, I just downloaded it

• Eyes Without a Face (1960) - France
• Peeping Tom (1960) - UK
• The Seventh Curse (1986) - Hong Kong
• Tetsuo (1989) - Japan
• Body Melt (1993) - Australia
• Versus (2000) - Japan
• The Devil's Backbone (2001) - Spain
• Shaun of the Dead (2004) - UK
• Calvaire (2004) - Belgium/Luxembourg
• Romasanta (2004) - Spain
• Martyrs (2008) - France
• The Loved Ones (2009) - Australia
• Timecrimes (2007) - France
• Adam Chaplin (2011) - Italy
• Juan of the Dead (2011) - Cuba

Glad to see this thread rolling 🙌

I'm proposing Deathgasm from New Zealand.

It's comedy-horror rather than horror-horror, but it fits the seasonal theme

https://en.wikipedia.org/wiki/Thirst_(2009_film)