The 20th Writers Guild of America Awards honored the best film writers and television writers of 1967. Winners were announced in 1968.
| 20th WGA Awards |
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| Date | March 22, 1968 |
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| Organized by | Writers Guild of America, East and the Writers Guild of America, West |
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Winners and nominees
Film
Winners are listed first highlighted in boldface.
| Best Written Musical - Thoroughly Modern Millie, Written by Richard Morris
- Camelot, Screenplay by Alan Jay Lerner; Based on the musical by Alan Jay Lerner and the novel The Once and Future King by T.H. White
- Doctor Dolittle, Screenplay by Leslie Bricusse; Based on the novels by Hugh Lofting
- How to Succeed in Business Without Really Trying, Screenplay by David Swift; Based on the novel by Shepherd Mead and the books by Abe Burrows, Jack Weinstock and Willie Gilbert
| Best Written American Drama - Bonnie and Clyde, Written by Robert Benton and David Newman
- Guess Who's Coming to Dinner, Written by William Rose
- In Cold Blood, Screenplay by Richard Brooks; Based on the novel by Truman Capote
- In the Heat of the Night, Screenplay by Stirling Silliphant; Based on the novel by John Ball
- Up the Down Staircase, Screenplay by Tad Mosel; Based on the novel by Bel Kaufman
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| Best Written American Comedy - The Graduate, Screenplay by Buck Henry and Calder Willingham; Based on the novel by Charles Webb
- Barefoot in the Park, Screenplay by Neil Simon; Based on his play
- Divorce American Style, Screenplay by Norman Lear; Story by Robert Kaufman
- The Flim-Flam Man, Screenplay by William Rose; Based on the novel by Guy Owen
- A Guide for the Married Man, Screenplay by Frank Tarloff; Based on the book by Frank Tarloff
| Best Written American Original Screenplay - Bonnie and Clyde, Written by Robert Benton and David Newman
- Guess Who's Coming to Dinner, Written by William Rose
- The President's Analyst, Written by Theodore J. Flicker
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Television
| Episodic Comedy - "The Honeymooners: Movies Are Better Than Ever" – The Jackie Gleason Show (CBS) – Marvin Marx, Walter Stone and Rod Parker
- "Where-What-How-Who Am I?" – Get Smart (CBS) – Barry E. Blitzer, and Ray Brenner
- "Bronzefinger" – Get Smart (CBS) – Lila Garrett and Bernie Kahn
- "Rain, Snow and Rice" – That Girl (ABC) – James L. Brooks
| Episodic Drama - "The City on the Edge of Forever" – Star Trek (NBC) – Harlan Ellison
- "Fandango" – Gunsmoke (CBS) – Don Ingalls
- "Odds on Evil" – Mission: Impossible (CBS) – William Read Woodfield and Allan Balter
- "The Return of the Archons" – Star Trek (NBC) – Boris Sobelman (teleplay) and Gene Roddenberry (story)
- "The Martyr" – The Big Valley (ABC) – Mel Goldberg
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| Best Written Dramatic Anthology - Noon Wine – Sam Peckinpah
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Special awards
| Laurel Award for Screenwriting Achievement |
| Casey Robinson |
| Valentine Davies Award |
| George Seaton |