I see this list being somewhat impossible. Hard to consider M a horror film, but I'll give this a shot. 

In the Empire of Passion (1980) - Nagisa Oshima
Kwaidan (1964) - Masaki Kobayashi
Vampyr (1931) - Carl Theodor Dreyer
Nosferatu (1922) - F. W. Murnau
Faust (1926) - F. W. Murnau
Bay of Blood (1971) - Mario Bava
Horror Rises From the Tomb (1972) - Carlos Aured
Eyes Without a Face (1960) - Georges Franju
Haxaan (1922) - Benjamin Christensen
The Vanishing (198 - George Sluizer

Just noticed foreign horror films kinda suck