The Writers Guild lists the 101 Greatest Screenplays. Among them are many familliar classics, like "Casablanca," "The Godfather," "Chinatown," "Citizen Cane" and "All About Eve," which comprise the top five. Check out the top twenty below and the full list here.
The youngest scripts on the list are Charlie Kaufman's "Eternal Sunshine of the Spotless Mind" (2004) at #24, Charlie Kaufman and Donald Kaufman's "Adaptation" (2002) at #77, Alexander Payne and Jim Taylor's "Sideways" (2004) at #90 and Christopher Nolan's "Memento" (2000) at #100. The '90s also fared well with "Shakespeare in Love," "American Beauty," "Pulp Fiction," "The Sixth Sense," Being John Malkovich," "Forrest Gump," "L.A. Confidential," "Fargo," "The Usual Suspects," "The Shawshank Redemption," "Jerry Maguire" and "Thelma & Louise."
Screenplay by Julius J. & Philip G. Epstein and Howard Koch. Based on the play "Everybody Comes to Rick's" by Murray Burnett and Joan Alison
2. THE GODFATHER
Screenplay by Mario Puzo and Francis Ford Coppola. Based on the novel by Mario Puzo
Written by Robert Towne
4. CITIZEN KANE
Written by Herman Mankiewicz and Orson Welles
5. ALL ABOUT EVE
Screenplay by Joseph L. Mankiewicz. Based on "The Wisdom of Eve," a short story and radio play by Mary Orr
6. ANNIE HALL
Written by Woody Allen and Marshall Brickman
7. SUNSET BLVD.
Written by Charles Brackett & Billy Wilder and D.M. Marshman, Jr.
Written by Paddy Chayefsky
9. SOME LIKE IT HOT
Screenplay by Billy Wilder & I.A.L. Diamond. Based on "Fanfare of Love," a German film written by Robert Thoeren and M. Logan
10. THE GODFATHER II
Screenplay by Francis Ford Coppola and Mario Puzo. Based on Mario Puzo's novel "The Godfather"
11. BUTCH CASSIDY AND THE SUNDANCE KID
Written by William Goldman
12. DR. STRANGELOVE
Screenplay by Stanley Kubrick and Peter George and Terry Southern. Based on novel "Red Alert" by Peter George
13. THE GRADUATE
Screenplay by Calder Willingham and Buck Henry. Based on the novel by Charles Webb
14. LAWRENCE OF ARABIA
Screenplay by Robert Bolt and Michael Wilson. Based on the life and writings of Col. T.E. Lawrence
15. THE APARTMENT
Written by Billy Wilder & I.A.L. Diamond
16. PULP FICTION
Written by Quentin Tarantino. Stories by Quentin Tarantino & Roger Avary
Screenplay by Larry Gelbart and Murray Schisgal. Story by Don McGuire and Larry Gelbart
18. ON THE WATERFRONT
Screen Story and Screenplay by Budd Schulberg. Based on "Crime on the Waterfront" articles by Malcolm Johnson
19. TO KILL A MOCKINGBIRD
Screenplay by Horton Foote. Based on the novel by Harper Lee
20. IT'S A WONDERFUL LIFE
Screenplay by Frances Goodrich & Albert Hackett & Frank Capra. Based on short story "The Greatest Gift" by Philip Van Doren Stern. Contributions to screenplay Michael Wilson and Jo Swerling