Some stats:
Number of nominations per year:
- 1960: 20
- 1961: 20
- 1962: 21
- 1963: 19
- 1964: 24
- 1965: 13
- 1966: 18
- 1967: 21
- 1968: 24
- 1969: 12
Directors with multiple nominations:
2
Alfred Hitchcock: Psycho; The Birds
Arthur Penn: Bonnie and Clyde; The Miracle Worker
Billy Wilder: One, Two, Three; The Apartment
David Lean: Doctor Zhivago; Lawrence of Arabia
Don Chaffey: Jason and the Argonauts; One Million Years B.C.
François Truffaut: Fahrenheit 451; Jules and Jim
Guy Hamilton: Goldfinger; The Battle of Britain
Henry Hathaway: The Sons of Katie Elder; True Grit
J. Lee Thompson: Cape Fear; The Guns of Navarone
Jean-Luc Godard: Breathless; Contempt
Jean-Pierre Melville: Army of Shadows; Le Samourai
Kaneto Shindō: Kuroneko; Onibaba
Ken Annakin: Swiss Family Robinson; The Longest Day
Mario Bava: Black Sabbath; Blood and Black Lace
Michelangelo Antonioni: Blow-Up; L'Avventura
Mike Nichols: The Graduate; Who's Afraid of Virginia Woolf?
Norman Jewison: In the Heat of the Night; The Thomas Crown Affair
Otto Preminger: Bunny Lake is Missing; Exodus
Richard Brooks: Elmer Gantry; In Cold Blood
Richard Lester: A Funny Thing Happened on the Way to the Forum; A Hard Day's Night
Robert Bresson: Au Hasard Balthazar; Mouchette
Roger Corman: The Masque of the Red Death; The Pit and the Pendulum
William Wyler: Funny Girl; The Children's Hour
Wolfgang Reitherman: One Hundred and One Dalmatians; The Jungle Book
3
Federico Fellini: 8½; Juliet of the Spirits; La Dolce Vita
Ishirō Honda: Destroy All Monsters; Ghidorah, the Three-Headed Monster; Mothra vs. Godzilla
John Frankenheimer: Seconds; Seven Days in May; The Manchurian Candidate
John Huston: Casino Royale; The Misfits; The Night of the Iguana
John Sturges: Ice Station Zebra; The Great Escape; The Magnificent Seven
Masaki Kobayashi: Harakiri; Kwaidan; Samurai Rebellion
Robert Aldrich: Hush… Hush, Sweet Charlotte; The Dirty Dozen; What Ever Happened to Baby Jane?
Robert Stevenson: Mary Poppins; The Absent-Minded Professor; The Love Bug
Sidney Lumet: Fail Safe; Long Day's Journey Into Night; The Pawnbroker
4
Blake Edwards: A Shot in the Dark; Breakfast at Tiffany's; Days of Wine and Roses; The Pink Panther
Luis Buñuel: Belle de Jour; Diary of a Chambermaid; The Exterminating Angel; Viridiana
Robert Wise: The Haunting; The Sand Pebbles; The Sound of Music; West Side Story
Roman Polanski: Cul-de-sac; Repulsion; Rosemary's Baby; The Fearless Vampire Killers
Sergio Leone: A Fistful of Dollars; For a Few Dollars More; Once Upon a Time in the West; The Good, the Bad and the Ugly
Stanley Kramer: Guess Who's Coming to Dinner; Inherit the Wind; It's a Mad, Mad, Mad, Mad World; Judgment at Nuremberg
Stanley Kubrick: 2001: A Space Odyssey; Dr. Strangelove; Lolita; Spartacus
Terence Young: Dr. No; From Russia with Love; Thunderball; Wait Until Dark
5
Akira Kurosawa: High and Low; Red Beard; Sanjuro; The Bad Sleep Well; Yojimbo
6
Ingmar Bergman: Persona; Shame; The Silence; The Virgin Spring; Through a Glass Darkly; Winter Light