So i think it's an interesting subject to everyone to share their favourite movie by decade.
(by the way i do not speek english perfectly so expect some mistake here and there)
for me it's (I have not seen every movie and it's my personal opinion)
1940
1. Rope (Hitchcock)
2. Notorious (Hitchcock)
3. The Treasure of Sierra Madre (John Huston)
4. It's a wonderfull Life (Frank Capra)
5. Casablanca (Michael Curtiz)
1950
1. 12 Angry Men (Sidney Lumet)
2. Rear Window, Vertigo, North by Northwest (Hitchcock)
3. The 400 Blows (Truffaut)
4. Anatomy of a Murder (Otto Preminger)
5. Ikiru (Kurosawa)
1960
1. The Graduate (Mike Nichols)
2. To Kill a Mockingbird (Robert Mulligan)
3. The Appartment (Billy Wilder)
4. Psycho (Hitchcock)
5. Dr Strangelove (Kubrick)
1970
1. Clockwork Orange (Kubrick)
2. One Flew Over The Cuckoos Nest (Milos Forman)
3. Chinatown (Roman Polanski)
4. Star Wars (George Lucas)
5. Jaws (Spielberg)
1980
1. Dead Poets Society (Peter Weir)
2. Empire Strike Back (George Lucas)
3. Ferris Bueller's Day Off (John Hughes)
4. Cinema Paradiso (Giuseppe Tornatore)
5. Raiders of the lost ark (Spielberg)
1990
1. Shawshank Redemption (Frank Darabont)
2. Good Will Hunting (Gus Van Sant)
3. Life is Beautiful (Roberto Benigni)
4. Fight Club (Fincher)
5. Léon (Luc Besson)
2000
1. Donnie Darko (Richard Kelly)
2. Inglourious Basterds (Tarantino)
3. Into the Wild (Sean Penn)
4. Lost in Translation (Sofia Coppola)
5. Gran Torino (Clint Eastwood)
2010
1. Drive (Nicolas Winding Refn)
2. the last Harry Potter (David Yates)
3. A Separation (Asghar Farhadi)
4. 127 Hours (Danny Boyle)
5. Incendies (Denis Villeneuve) (a french canadian film)
(by the way i do not speek english perfectly so expect some mistake here and there)
for me it's (I have not seen every movie and it's my personal opinion)
1940
1. Rope (Hitchcock)
2. Notorious (Hitchcock)
3. The Treasure of Sierra Madre (John Huston)
4. It's a wonderfull Life (Frank Capra)
5. Casablanca (Michael Curtiz)
1950
1. 12 Angry Men (Sidney Lumet)
2. Rear Window, Vertigo, North by Northwest (Hitchcock)
3. The 400 Blows (Truffaut)
4. Anatomy of a Murder (Otto Preminger)
5. Ikiru (Kurosawa)
1960
1. The Graduate (Mike Nichols)
2. To Kill a Mockingbird (Robert Mulligan)
3. The Appartment (Billy Wilder)
4. Psycho (Hitchcock)
5. Dr Strangelove (Kubrick)
1970
1. Clockwork Orange (Kubrick)
2. One Flew Over The Cuckoos Nest (Milos Forman)
3. Chinatown (Roman Polanski)
4. Star Wars (George Lucas)
5. Jaws (Spielberg)
1980
1. Dead Poets Society (Peter Weir)
2. Empire Strike Back (George Lucas)
3. Ferris Bueller's Day Off (John Hughes)
4. Cinema Paradiso (Giuseppe Tornatore)
5. Raiders of the lost ark (Spielberg)
1990
1. Shawshank Redemption (Frank Darabont)
2. Good Will Hunting (Gus Van Sant)
3. Life is Beautiful (Roberto Benigni)
4. Fight Club (Fincher)
5. Léon (Luc Besson)
2000
1. Donnie Darko (Richard Kelly)
2. Inglourious Basterds (Tarantino)
3. Into the Wild (Sean Penn)
4. Lost in Translation (Sofia Coppola)
5. Gran Torino (Clint Eastwood)
2010
1. Drive (Nicolas Winding Refn)
2. the last Harry Potter (David Yates)
3. A Separation (Asghar Farhadi)
4. 127 Hours (Danny Boyle)
5. Incendies (Denis Villeneuve) (a french canadian film)