This was a good question and made me realize how few foreign horror films I have seen. My list is short.

Nosferatu - 1922/Murnau
Nosferatu- 1979/Herzog
Les Diaboliques- 1955/Clouzot

Eyes Without a Face - 1960/Franju
Peeping Tom - 1960/Boehm

Phone- 2004/Byeong-ki Ahn (and all those similar films)
A Tale of Two Sisters- 2004/Ji-woon Kim

Thanks to your lists I have added "Kwaidan", "Onibaba", "Audition" and "Bay of Blood" to my list to start.

Has anyone seen "Blade of the Ripper." (1971/ Martino) ? I have heard it was good but cannot find it to rent yet. 

"Susperia" sounds intriging. (1977/Argento) but some I know say not to bother.