1. Ingmar Bergman (Best Film: PERSONA)
2. Andrei Tarkovsky (Best Film: ANDREI RUBLEV)
3. Charles Chaplin (Best Film: CITY LIGHTS)
4. Robert Bresson (Best Film: AU HASARD BALTHAZAR)
5. Orson Welles (Best Film: CITIZEN KANE [duh])
6. Alfred Hitchcock (Best Film: VERTIGO)
7. Federico Fellini (Best Film: 8 1/2 [duh, again])
8. D.W. Griffith (Best Film: INTOLERANCE)
9. Akira Kurosawa (Best Film: SEVEN SAMURAI)
10. John Ford (Best Film: THE SEARCHERS)

Other greats are Sergei Eisenstein, Kenji Mizoguchi, Jean-Luc Godard, Francois Truffaut, Pier Paolo Pasolini, Yasujiro Ozu, Dziga Vertov, Jean Renoir, Stanley Kubrick...

...too many to name, and there's no way I could rank them all!