I believe I saw a thread like this once but I'm not sure, I can't find it anyhow. Not limited to one a decade - impossible! These are my favourite horror movies from every decade.
1920s
The Cabinet of Dr Caligari (1920)
1930s
Dr Jekyll and Mr Hyde (1931)
White Zombie (1932)
1940s
Cat People (1942)
I Walked With A Zombie (1943)
Dead Of Night (1945)
1950s
Night Of The Demon (1957)
Curse Of Frankenstein (1957)
Horror Of Dracula (1958)
1960s
Black Sunday (1960)
The Whip and The Body (1963) - pretty much any Bava film.
Night Of The Living Dead (1968)
1970s
Lisa and The Devil (1972)
Flesh For Frankenstein (1973) - bit more of a satire or comedy, but I'm counting it. Dracula's brilliant as well.
Suspiria (1977)
1980s
Cat People (1982)
Return Of The Living Dead (1985)
1990s on, I'm not sure about yet.
1920s
The Cabinet of Dr Caligari (1920)
1930s
Dr Jekyll and Mr Hyde (1931)
White Zombie (1932)
1940s
Cat People (1942)
I Walked With A Zombie (1943)
Dead Of Night (1945)
1950s
Night Of The Demon (1957)
Curse Of Frankenstein (1957)
Horror Of Dracula (1958)
1960s
Black Sunday (1960)
The Whip and The Body (1963) - pretty much any Bava film.
Night Of The Living Dead (1968)
1970s
Lisa and The Devil (1972)
Flesh For Frankenstein (1973) - bit more of a satire or comedy, but I'm counting it. Dracula's brilliant as well.
Suspiria (1977)
1980s
Cat People (1982)
Return Of The Living Dead (1985)
1990s on, I'm not sure about yet.
