The 21st Writers Guild of America Awards honored the best film writers and television writers of 1968. Winners were announced in 1969.
| 21st WGA Awards |
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| Date | 1969 |
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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 - Funny Girl, Screenplay by Isobel Lennart; Based on the musical by Isobel Lennart
- Finian's Rainbow, Screenplay by E.Y. Harburg and Fred Saidy; Based on their book
- Star!, Written by William Fairchild
| Best Written American Drama - The Lion in Winter, Screenplay by James Goldman; based on his play
- The Heart Is a Lonely Hunter, Screenplay by Thomas C. Ryan; Based on the novel by Carson McCullers
- Petulia, Screenplay by Lawrence B. Marcus; Based on the novel by John Haase
- Rachel, Rachel, Screenplay by Stewart Stern; Based on the novel by Margaret Laurence
- Rosemary's Baby, Screenplay by Roman Polanski; Based on the novel by Ira Levin
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| Best Written American Comedy - The Odd Couple, Screenplay by Neil Simon; Based on his play
- Hot Millions, Written by Ira Wallach and Peter Ustinov
- I Love You, Alice B. Toklas!, Written by Paul Mazursky and Larry Tucker
- The Producers, Written by Mel Brooks
- Yours, Mine and Ours, Screenplay by Melville Shavelson and Mort Lachman; Story by Bob Carroll Jr. and Madelyn Davis
| Best Written American Original Screenplay - The Producers, Written by Mel Brooks
- Buona Sera, Mrs. Campbell, Screenplay by Melvin Frank, Denis Norden and Sheldon Keller
- Faces, Written by John Cassavetes
- I Love You, Alice B. Toklas!, Written by Paul Mazursky and Larry Tucker
- The Brotherhood, Written by Lewis John Carlino
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Television
| Episodic Comedy - "Viva mart" – Get Smart (CBS) – Bill Idelson and Sam Bobrick
- "The Old Man & the She" – He & She (CBS) – Leonard Stern and Arne Sultan
- "Knock, Knock, Who's There? Fernando, Fernando Who?" – He & She (CBS) – Chris Hayward and Allan Burns
- "Before You Bury Me Can I Say Something?" – He & She (CBS) – Jim Parker and Arold Margolin
| Episodic Drama - "To Kill a Madman" – Judd for the Defense (ABC) – Robert Lewin
- "Cocoon" – Hawaii Five-O (CBS) – Leonard Freeman
- "No Law Against Murder" – Judd for the Defense (ABC) – Harold Gast
- "Commitment" – Judd for the Defense (ABC) – Paul Monash
- "The Name Is Mannix" – Mannix (CBS) – Bruce Geller
- "Return to Tomorrow" – Star Trek (NBC) – John T. Dugan
- "Take Your Lover in the Ring" – The Outcasts (ABC) – Anthony Lawrence
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Special awards
| Laurel Award for Screenwriting Achievement |
| Carl Foreman |
| Valentine Davies Award |
| Dore Schary |