Blade Runner

The first and most obvious mention is Blade Runner. While it's almost hard to call it cyberpunk, due to the lack of cyber, it's even harder to call it anything but cyberpunk, thanks to the masterful aesthetics and atmosphere.

Alien

David Cronenberg

John Carpenter

The Matrix

Phillip K. Dick

Robocop

Terminator

Tron

William Gibson

Other movies

Japanese Cyberpunk

Proto-cyberpunk movies

Hacker movies

Documentaries

Related but not really quite cyberpunk