The 57th Writers Guild of America Awards, given on February 19, 2005, honored the film and television best writers of 2004.

Sideways - Alexander Payne and Jim Taylor

• Before Sunset - Richard Linklater, Julie Delpy, Ethan Hawke and Kim Krizan
• Mean Girls - Tina Fey
• Million Dollar Baby - Paul Haggis
• The Motorcycle Diaries (Diarios de motocicleta) - José Rivera

Eternal Sunshine of the Spotless Mind - Pierre Bismuth, Michel Gondry and Charlie Kaufman

• The Aviator - John Logan
• Garden State - Zach Braff
• Hotel Rwanda - Keir Pearson and Terry George
• Kinsey - Bill Condon

Super Size Me - Morgan Spurlock

• Bright Leaves - Ross McElwee
• Control Room - Julia Bacha and Jehane Noujaim
• Home of the Brave - Paola di Florio
• The Hunting of the President - Harry Thomason and Nickolas Perry
• In the Realms of the Unreal - Jessica Yu

"The Supremes" - The West Wing - Debora Cahn

• "Falling Into Place" - Six Feet Under - Craig Wright
• "Long Term Parking" - The Sopranos - Terence Winter
• "Memorial Day" - The West Wing - John Sacret Young and Josh Singer

"Pier Pressure" - Arrested Development - James Vallely and Mitch Hurwitz
"Ida's Boyfriend" - Malcolm in the Middle - Neil Thompson

• "Splat!" - Sex and the City - Jenny Bicks and Cindy Chupack
• "The Ick Factor" - Sex and the City - Julie Rottenberg and Elisa Zuritsky
• "Pilot" - Wonderfalls - Bryan Fuller and Todd Holland

• Best Animation Screenplay:
  • The Simpsons - "Catch 'Em If You Can"
• Best Daytime Serial:
• The Guiding Light

• WGA - Previous award winners