Óscar de Melhor Atriz Secundária ou Coadjuvante (no original em inglês Academy Award for Best Supporting Actress) é um dos prêmios dados a atrizes pela Academia de Artes e Ciências Cinematográficas desde 1937. Inicialmente, o troféu para este prêmio era uma placa.
Para este prêmio, as atrizes que tenham actuado num papel secundário, são indicadas pelos atores e atrizes membros da Academia e as vencedoras são escolhidas por todos os seus membros. Os filmes são escolhidos em geral entre aqueles lançados no ano anterior; por exemplo, o Oscar de atriz coadjuvante de 1999 foi anunciado e atribuído na cerimônia realizada em 2000.
Tatum O'Neal, vencedora do prêmio de melhor atriz coadjuvante em 1974 por sua atuação no filme Paper Moon, foi a atriz mais jovem a ganhar um Oscar, aos dez anos de idade. Em segundo lugar vem Anna Paquin, premiada aos onze anos em 1994, pela atuação no filme The Piano. O único filme a ter três indicações (Diane Cilento, Edith Evans e Joyce Redman) ao Oscar por melhor atriz coadjuvante é Tom Jones, que não venceu nenhuma indicação e 24 filmes já tiveram duas artistas suas indicadas como melhor atriz coadjuvante.
Somente duas atrizes que venceram o prêmio de melhor atriz coadjuvante por duas vezes: Shelley Winters em 1960 (The Diary of Anne Frank) e 1966 (A Patch of Blue) e também a atriz Dianne Wiest em 1987 (Hannah and Her Sisters) e 1995 (Bullets Over Broadway).
O ano indicado refere-se ao do que ocorreu a entrega do prêmio, relativo à melhor atriz coadjuvante do ano anterior.
Vencedoras e indicadas Década de 1930 AnoVencedora e indicadasFilmePersonagem 1937 Gale Sondergaard Anthony Adverse Faith PaleologusBeulah Bondi The Gorgeous Hussy Rachel JacksonAlice Brady My Man Godfrey Angelica BullockBonita Granville These Three Mary TilfordMaria Ouspenskaya Dodsworth Baronesa Von Obersdorf 1938 Alice Brady In Old Chicago Molly O'LearyAndrea Leeds Stage Door Kay HamiltonAnne Shirley Stella Dallas Laurel "Lollie" DallasClaire Trevor Dead End FranceyMay Whitty Night Must Fall Sra. Bramson 1939 Fay Bainter Jezebel Tia Belle MasseyBeulah Bondi Of Human Hearts Mary WilkinsBillie Burke Merrily We Live Emily KilbourneSpring Byington You Can't Take It with You Penny SycamoreMiliza Korjus The Great Waltz Carla Donner
Década de 1940 AnoVencedora e indicadasFilmePersonagem 1940 Hattie McDaniel Gone with the Wind MammyOlivia de Havilland Gone with the Wind Melanie HamiltonGeraldine Fitzgerald Wuthering Heights Isabella LintonEdna May Oliver Drums Along the Mohawk Sarah McKlennarMaria Ouspenskaya Love Affair Avó Janou 1941 Jane Darwell The Grapes of Wrath Ma JoadJudith Anderson Rebecca Sra. DanversRuth Hussey The Philadelphia Story Elizabeth ImbrieBarbara O'Neil All This, and Heaven Too Duquesa de PraslinMarjorie Rambeau Primrose Path Mamie Adams 1942 Mary Astor The Great Lie Sandra KovakSara Allgood How Green Was My Valley Beth MorganPatricia Collinge The Little Foxes Birdie HubbardTeresa Wright Alexandra GiddensMargaret Wycherly Sergeant York Mãe York 1943 Teresa Wright Mrs. Miniver Carol BeldonGladys Cooper Now, Voyager Sra. ValeAgnes Moorehead The Magnificent Ambersons Fanny MiniferSusan Peters Random Harvest Kitty ChilcetMay Whitty Mrs. Miniver Senhora Beldon 1944 Katina Paxinou For Whom the Bell Tolls PilarGladys Cooper The Song of Bernadette Irmã Marie Therese VauzousAnne Revere Louise SoubirousPaulette Goddard So Proudly We Hail! Tenente Hoan O'DoulLucile Watson Watch on the Rhine Fanny Farrelly 1945 Ethel Barrymore None but the Lonely Heart Ma MottJennifer Jones Since You Went Away Jane Deborah HiltonAngela Lansbury Gaslight Nancy OliverAline MacMahon Dragon Seed Esposa de Ling TanAgnes Moorehead Mrs. Parkington Baronesa Aspatia Conti 1946 Anne Revere National Velvet Araminty BrownEve Arden Mildred Pierce Ida CorwinAnn Blyth Veda Pierce ForresterAngela Lansbury The Picture of Dorian Gray Sibyl VaneJoan Lorring The Corn Is Green Bessie Watty 1947 Anne Baxter The Razor's Edge Sophie MacDonaldEthel Barrymore The Spiral Staircase Sra. WarrenLillian Gish Duel in the Sun Laura Belle McCanlesFlora Robson Saratoga Trunk Angelique BuitonGale Sondergaard Anna and the King of Siam Senhora Thiang 1948 Celeste Holm Gentleman's Agreement Anne DettreyEthel Barrymore The Paradine Case Sophie HorfieldGloria Grahame Crossfire Ginny TremaineMarjorie Main The Egg and I Ma KettleAnne Revere Gentleman's Agreement Sra. Green 1949 Claire Trevor Key Largo Gaye DawnBarbara Bel Geddes I Remember Mama Katrin HansonEllen Corby Tia TrinaAgnes Moorehead Johnny Belinda Aggie McDonaldJean Simmons Hamlet Ofélia
Década de 1950 AnoVencedora e indicadasFilmePersonagem 1950 Mercedes McCambridge All the King's Men Sadie BurkeEthel Barrymore Pinky Srta. EmEthel Waters Avó da PinkyCeleste Holm Come to the Stable Irmã EscolásticaElsa Lanchester Amelia Potts 1951 Josephine Hull Harvey Veta Louise SimmonsHope Emerson Caged Evelyn HarperCeleste Holm All About Eve Karen RichardsThelma Ritter BirdieNancy Olson Sunset Boulevard Betty Schaefer 1952 Kim Hunter A Streetcar Named Desire Stella KowalskiJoan Blondell The Blue Veil Annie RawlingsMildred Dunnock Death of a Salesman Linda LomanLee Grant Detective Story Larápio de LojaThelma Ritter The Mating Season Ellen McNulty 1953 Gloria Grahame The Bad and the Beautiful Rosemary BartlowJean Hagen Singin' in the Rain Lina LamontColette Marchand Moulin Rouge Marie CharletTerry Moore Come Back, Little Sheba Marie BuckholderThelma Ritter With a Song in My Heart Clancy 1954 Donna Reed From Here to Eternity Alma "Lorene" BurkeGrace Kelly Mogambo Linda NordleyGeraldine Page Hondo Angie LoweMarjorie Rambeau Torch Song Sra. StewartThelma Ritter Pickup on South Street Moe 1955 Eva Marie Saint On the Waterfront Edie DoyleNina Foch Executive Suite Erica MartinKaty Jurado Broken Lance Sra. DevereauxJan Sterling The High and the Mighty Sally McKeeClaire Trevor May Holst 1956 Jo Van Fleet East of Eden KateBetsy Blair Marty Clara SnyderPeggy Lee Pete Kelly's Blues Rose HopkinsMarisa Pavan The Rose Tattoo Rosa Delle RoseNatalie Wood Rebel Without a Cause Judy 1957 Dorothy Malone Written on the Wind Marylee HadleyMildred Dunnock Baby Doll Rose ComfortEileen Heckart The Bad Seed Hortense DaiglePatty McCormack Rhoda PenmarkMercedes McCambridge Giant Luz Benedict 1958 Miyoshi Umeki Sayonara KatsumiCarolyn Jones The Bachelor Party A ExistencialistaElsa Lanchester Witness for the Prosecution Srta. PlimsollHope Lange Peyton Place Selena CrossDiane Varsi Allison MacKenzie 1959 Wendy Hiller Separate Tables Pat CooperPeggy Cass Auntie Mame Agnes GoochMartha Hyer Some Came Running Gwen FrenchMaureen Stapleton Lonelyhearts Fay DoyleCara Williams The Defiant Ones Mãe de Billy
Década de 1960 AnoVencedora e indicadasFilmePersonagem 1960 Shelley Winters The Diary of Anne Frank Tetronella Van DaanHermione Baddeley Room at the Top ElspethSusan Kohner Imitation of Life Sarah Jane (18 anos)Juanita Moore Annie JohnsonThelma Ritter Pillow Talk Alma 1961 Shirley Jones Elmer Gantry Lulu BainesGlynis Johns The Sundowners Sra. FirthShirley Knight The Dark at the Top of the Stairs Reenie FloodJanet Leigh Psycho Marion CraneMary Ure Sons and Lovers Clara Dawes 1962 Rita Moreno West Side Story AnitaFay Bainter The Children's Hour Amelia TilfordJudy Garland Judgment at Nuremberg Irene Hoffman WallnerLotte Lenya The Roman Spring of Mrs. Stone CondessaUna Merkel Summer and Smoke Sra. Winemiller 1963 Patty Duke The Miracle Worker Helen KellerMary Badham To Kill a Mockingbird Scout FinchShirley Knight Sweet Bird of Youth Heavenly FinleyAngela Lansbury The Manchurian Candidate Eleanor IselinThelma Ritter Birdman of Alcatraz Elizabeth Stroud 1964 Margaret Rutherford The V.I.P.s Duquesa de BrightonDiane Cilento Tom Jones Molly SeagrimEdith Evans Srta. WesternJoyce Redman Sra. WatersLilia Skala Lilies of the Field Mãe Maria 1965 Lila Kedrova Zorba the Greek Madame HortenseGladys Cooper My Fair Lady Sra. HigginsEdith Evans The Chalk Garden Sra. St. MaughamGrayson Hall The Night of the Iguana Judith FellowesAgnes Moorehead Hush… Hush, Sweet Charlotte Velma Cruther 1966 Shelley Winters A Patch of Blue Rose-Ann D'ArcyRuth Gordon Inside Daisy Clover Sra. CloverJoyce Redman Othello EmíliaMaggie Smith DesdemonaPeggy Wood The Sound of Music Abbess 1967 Sandy Dennis Who's Afraid of Virginia Woolf? HoneyWendy Hiller A Man for All Seasons Alice MoreJocelyne LaGarde Hawaii Rainha MalamaVivien Merchant Alfie LilyGeraldine Page You're a Big Boy Now Margery Chanticleer 1968 Estelle Parsons Bonnie and Clyde Blanche BarrowCarol Channing Thoroughly Modern Millie Mussy Van HossmereMildred Natwick Barefoot in the Park Ethel BanksBeah Richards Guess Who's Coming to Dinner Sra. PrenticeKatharine Ross The Graduate Elaine Robinson 1969 Ruth Gordon Rosemary's Baby Minnie CastevetLynn Carlin Faces Maria ForstSondra Locke The Heart Is a Lonely Hunter Mick KellyKay Medford Funny Girl Rose BriceEstelle Parsons Rachel, Rachel Calla Mackie
Década de 1970 AnoVencedora e indicadasFilmePersonagem 1970 Goldie Hawn Cactus Flower Toni SimmonsCatherine Burns Last Summer RhodaDyan Cannon Bob & Carol & Ted & Alice Alice HendersonSylvia Miles Midnight Cowboy CassSusannah York They Shoot Horses, Don't They? Alice LeBlanc 1971 Helen Hayes Airport Ada QuonsettKaren Black Five Easy Pieces Rayette DipestoLee Grant The Landlord Joyse EndersSally Kellerman M*A*S*H Major Margaret J. HoulihanMaureen Stapleton Airport Inez Guerrero 1972 Cloris Leachman The Last Picture Show Ruth PopperEllen Burstyn The Last Picture Show Lois FarrowBarbara Harris Who Is Harry Kellerman and Why Is He Saying Those Terrible Things About Me? Allison DensmoreMargaret Leighton The Go-Between Sra. MaudsleyAnn-Margret Carnal Knowledge Bobbie 1973 Eileen Heckart Butterflies Are Free Sra. BackerJeannie Berlin The Heartbreak Kid Lila KolodnyGeraldine Page Pete 'n' Tillie GertrudeSusan Tyrrell Fat City OmaShelley Winters The Poseidon Adventure Belle Rosen 1974 Tatum O'Neal Paper Moon Addie LogginsLinda Blair The Exorcist Regan MacNeilCandy Clark American Graffiti Bebbie DunhamMadeline Kahn Paper Moon Trixie DelightSylvia Sidney Summer Wishes, Winter Dreams Sra. Pritchett 1975 Ingrid Bergman Murder on the Orient Express Greta OhlssonValentina Cortese La Nuit Américaine SeverineMadeline Kahn Blazing Saddles Lili Von ShtuppDiane Ladd Alice Doesn't Live Here Anymore Flo CastleberryTalia Shire The Godfather Part II Constanzia "Connie" Corleone 1976 Lee Grant Shampoo Felicia CarrRonee Blakley Nashville Barbara JeanLily Tomlin Linnea ReeseSylvia Miles Farewell, My Lovely Jessie Halstead FlorianBrenda Vaccaro Once Is Not Enough Linda Riggs 1977 Beatrice Straight Network Louise SchumacherJane Alexander All the President's Men Judy HobackJodie Foster Taxi Driver Iris SteensmaLee Grant Voyage of the Damned Lillian RosenPiper Laurie Carrie Margaret White 1978 Vanessa Redgrave Julia JuliaLeslie Browne The Turning Point Emilia RodgersQuinn Cummings The Goodbye Girl Lucy McFaddenMelinda Dillon Close Encounters of the Third Kind Gillian GuilerTuesday Weld Looking for Mr. Goodbar Katherine 1979 Maggie Smith California Suite Diana BarrieDyan Cannon Heaven Can Wait Julia FarnsworthPenelope Milford Coming Home Vi MunsonMaureen Stapleton Interiors PearlMeryl Streep The Deer Hunter Linda
Década de 1980