1940-present: Wikipedia

Recognizes the best script not based upon previously published material

YearMovieScreenwriters
2019ParasiteBong Joon-ho & Han Jin-won
2018Green BookBrian Currie, Peter Farrelly, and Nick Vallelonga
2017Get OutJordan Peele
2016Manchester by the SeaKenneth Lonergan
2015SpotlightTom McCarthy and Josh Singer
2014BirdmanAlejandro G. Iñárritu, Nicolás Giacobone, Alexander Dinelaris, Jr., and Armando Bo
2013HerSpike Jonze
2012Django UnchainedQuentin Tarantino
2011Midnight in ParisWoody Allen
2010The King’s SpeechDavid Seidler
2009The Hurt LockerMark Boal
2008MilkDustin Lance Black
2007JunoDiablo Cody
2006Little Miss SunshineMichael Arndt
2005CrashPaul Haggis & Bobby Moresco
2004Eternal Sunshine of the Spotless MindPierre Bismuth, Michel Gondry, and Charlie Kaufman
2003Lost in TranslationSofia Coppola
2002Talk to Her (Hable con ella)Pedro Almodóvar
2001Gosford ParkJulian Fellowes
2000Almost FamousCameron Crowe
1999American BeautyAlan Ball
1998Shakespeare in LoveMarc Norman and Tom Stoppard
1997Good Will HuntingBen Affleck and Matt Damon
1996FargoJoel Coen and Ethan Coen
1995The Usual SuspectsChristopher McQuarrie
1994Pulp FictionQuentin Tarantino and Roger Avary
1993The PianoJane Campion
1992The Crying GameNeil Jordan
1991Thelma & LouiseCallie Khouri
1990GhostBruce Joel Rubin
1989Dead Poets SocietyTom Schulman
1988Rain ManRonald Bass and Barry Morrow
1987MoonstruckJohn Patrick Shanley
1986Hannah and Her SistersWoody Allen
1985WitnessWilliam Kelley, Earl Wallace, and Pamela Wallace
1984Places in the HeartRobert Benton
1983Tender MerciesHorton Foote
1982GandhiJohn Briley
1981Chariots of FireColin Welland
1980Melvin and HowardBo Goldman
1979Breaking AwaySteve Tesich
1978Coming HomeRobert C. Jones, Waldo Salt, and Nancy Dowd
1977Annie HallWoody Allen and Marshall Brickman
1976NetworkPaddy Chayefsky
1975Dog Day AfternoonFrank Pierson
1974ChinatownRobert Towne
1973The StingDavid S. Ward
1972The CandidateJeremy Larner
1971The HospitalPaddy Chayefsky
1970PattonFrancis Ford Coppola and Edmund H. North
1969Butch Cassidy and the Sundance KidWilliam Goldman
1968The ProducersMel Brooks
1967Guess Who’s Coming to DinnerWilliam Rose
1966 A Man and a WomanClaude Lelouch and Pierre Uytterhoeven
1965 DarlingFrederic Raphael
1964 Father GoosePeter Stone and Frank Tarloff
1963 How the West Was WonJames Webb
1962Divorce, Italian StyleEnnio de Concini, Pietro Germi, and Alfredo Giannetti
1961Splendor in the GrassWilliam Inge
1960The ApartmentI.A.L. Diamond and Billy Wilder
1959Pillow TalkClarence Greene, Maurice Richlin, Russell Rouse, and Stanley Shapiro 
1958The Defiant OnesNathan E. Douglas and Harold Jacob Smith
1957Designing WomanGeorge Wells
1956The Red BalloonAlbert Lamorisse
1955Interrupted MelodySonya Levien and William Ludwig
1954On the WaterfrontBudd Schulberg
1953TitanicCharles Brackett, Richard Breen, and Walter Reisch
1952The Lavender Hill MobT.E.B. Clarke
1951An American in ParisAlan Jay Lerner
1950Sunset BoulevardCharles Brackett, D.M. Marshman, Jr., and Billy Wilder
1949BattlegroundRobert Pirosh
1948NO AWARD GIVEN
1947The Bachelor and the Bobby-SoxerSidney Sheldon
1946The Seventh VeilMuriel Box and Sydney Box
1945Marie-LouiseRichard Schweizer
1944WilsonLamar Trotti
1943Princess O’RourkeNorman Krasna
1942Woman of the YearMichael Kanin and Ring Lardner, Jr.
1941Citizen KaneHerman J. Mankiewicz and Orson Welles
1940The Great McGintyPreston Sturges