LOscar al millor so (Academy Award for Sound Mixing) és un premi atorgat per l'Acadèmia de les Arts i les Ciències Cinematogràfiques, tots els anys des de 1930. Aquest premi Oscar reconeix el millor o més fonoestètic so, i en general es premia els millors enregistraments o mescles sonores. Sol anar lligat amb l'oscar a la millor edició de so. En les llistes que segueixen, el guanyador del premi es mostra en negreta en primer lloc i el segueixen els altres nominats.

Guanyadors i nominats Dècada de 1930 Any Pel·lícula Nominats 1930 The Big House Douglas Shearer, MGM Studio Sound Department The Case of Sergeant Grischa RKO Radio Studio Sound Department, John Tribby The Love Parade Paramount Famous Lasky Studio Sound Department, Franklin Hansen Raffles United Artists Studio Sound Department, Oscar Lagerstrom Song of the Flame First National Studio Sound Department, George Groves 1931 Paramount Publix Studio Sound Department MGM Studio Sound Department RKO Radio Studio Sound Department United Artists Studio Sound Department, Samuel Goldwyn 1932 Paramount Publix Studio Sound Department MGM Studio Sound Department RKO Radio Studio Sound Department Warner Bros., First National Studio Sound Department 1933 Adéu a les armes Paramount Studio Sound Department, Franklin Hansen El carrer 42 Warner Bros. Studio Sound Department, Nathan Levinson Gold Diggers of 1933 Warner Bros. Studio Sound Department, Nathan Levinson I Am a Fugitive from a Chain Gang Warner Bros. Studio Sound Department, Nathan Levinson 1934 One Night of Love Columbia Studio Sound Department, John Livadary The Affairs of Cellini United Artists Studio Sound Department, Thomas T. Moulton Cleopatra Paramount Studio Sound Department, Franklin B. Hansen Flirtation Walk Warner Bros., First National Studio Sound Department, Nathan Levinson L'alegre divorciada RKO Radio Studio Sound Department, Carl Dreher Imitació de la vida Universal Studio Sound Department, Theodore Soderberg Viva Villa! Metro-Goldwyn-Mayer Studio Sound Department, Douglas Shearer White Parade Fox Studio Sound Department, Edmund H. Hansen 1935 Naughty Marietta Metro-Goldwyn-Mayer Studio Sound Department, Douglas Shearer 1,000 Dollars a Minute Republic Studio Sound Department Bride of Frankenstein Universal Studio Sound Department, Gilbert Kurland El capità Blood Warner Bros., First National Studio Sound Department, Nathan Levinson The Dark Angel United Artists Studio Sound Department, Thomas T. Moulton I Dream Too Much RKO Radio Studio Sound Department, Carl Dreher The Lives of a Bengal Lancer Paramount Studio Sound Department, Franklin B. Hansen Love Me Forever Columbia Studio Sound Department, John P. Livadary Thanks a Million Fox Studio Sound Department, Edmund H. Hansen 1936 San Francisco Metro-Goldwyn-Mayer Studio Sound Department, Douglas Shearer Banjo on My Knee Fox Studio Sound Department, Edmund H. Hansen The Charge of the Light Brigade Warner Bros. Studio Sound Department, Nathan Levinson Dodsworth United Artists Studio Sound Department, Thomas T. Moulton General Spanky Hal Roach Studio Sound Department, Elmer A. Raguse Mr. Deeds Goes to Town Columbia Studio Sound Department, John P. Livadary The Texas Rangers Paramount Studio Sound Department, Franklin B. Hansen That Girl from Paris RKO Radio Studio Sound Department, John Aalberg Three Smart Girls Universal Studio Sound Department, Homer G. Tasker 1937 Huracà sobre l'illa United Artists Studio Sound Department, Thomas Moulton The Girl Said No Grand National Studio Sound Department, A.E. Kaye Hitting a New High RKO Radio Studio Sound Department, John Aalberg In Old Chicago Fox Studio Sound Department, Edmund H. Hansen The Life of Emile Zola Warner Bros. Studio Sound Department, Nathan Levinson Horitzons perduts Columbia Studio Sound Department, John P. Livadary Maytime Metro-Goldwyn-Mayer Studio Sound Department, Douglas Shearer One Hundred Men i a Girl Universal Studio Sound Department, Homer G. Tasker Topper Hal Roach Studio Sound Department, Elmer A. Raguse Wells Fargo Paramount Studio Sound Department, Loren L. Ryder 1938 The Cowboy and the Lady United Artists Studio Sound Department, Thomas Moulton Army Girl Republic Studio Sound Department, Charles L. Lootens Four Daughters Warner Bros. Studio Sound Department, Nathan Levinson If I Were King Paramount Studio Sound Department, Loren L. Ryder Merrily We Live Hal Roach Studio Sound Department, Elmer A. Raguse Suez 20th Century-Fox Studio Sound Department, Edmund H. Hansen Sweethearts Metro-Goldwyn-Mayer Studio Sound Department, Douglas Shearer That Certain Age Universal Studio Sound Department, Bernard B. Brown Intrigues femenines RKO Radio Studio Sound Department, John Aalberg No us l'endureu pas Columbia Studio Sound Department, John P. Livadary 1939 When Tomorrow Comes Universal Studio Sound Department, Bernard B. Brown Balalaika Metro-Goldwyn-Mayer Studio Sound Department, Douglas Shearer Allò que el vent s'endugué Samuel Goldwyn Studio Sound Department, Thomas T. Moulton Goodbye, Mr. Chips Denham Studio Sound Department, A.W. Watkins The Great Victor Herbert Paramount Studio Sound Department, Loren L. Ryder El geperut de Notre-Dame RKO Radio Studio Sound Department, John Aalberg Man of Conquest Republic Studio Sound Department, Charles L. Lootens Mr. Smith Goes to Washington Columbia Studio Sound Department, John P. Livadary Of Mice and Men Hal Roach Studio Sound Department, Elmer A. Raguse The Private Lives of Elizabeth and Essex Warner Bros. Studio Sound Department, Nathan Levinson The Rains Came 20th Century-Fox Studio Sound Department, Edmund H. Hansen

Dècada de 1940 Any Pel·lícula Nominats 1940 Strike Up the Band Metro-Goldwyn-Mayer Studio Sound Department, Douglas Shearer Behind the News Republic Studio Sound Department, Charles L. Lootens Captain Caution Hal Roach Studio Sound Department, Elmer A. Raguse El raïm de la ira 20th Century-Fox Studio Sound Department, Edmund H. Hansen The Howards of Virginia General Service Sound Department, Jack Whitney Miratge d'amor RKO Radio Studio Sound Department, John Aalberg North West Mounted Police Paramount Studio Sound Department, Loren L. Ryder El nostre poble Samuel Goldwyn Studio Sound Department, Thomas T. Moulton El falcó del mar Warner Bros. Studio Sound Department, Nathan Levinson Spring Parade Universal Studio Sound Department, Bernard B. Brown Too Many Husbands Columbia Studio Sound Department, John P. Livadary 1941 Lady Hamilton General Service Sound Department, Jack Whitney Appointment for Love Universal Studio Sound Department, Bernard B. Brown Bola de foc Samuel Goldwyn Studio Sound Department, Thomas T. Moulton The Chocolate Soldier Metro-Goldwyn-Mayer Studio Sound Department, Douglas Shearer Ciutadà Kane RKO Radio Studio Sound Department, John Aalberg The Devil Pays Off Republic Studio Sound Department, Charles L. Lootens Que verda era la meva vall 20th Century-Fox Studio Sound Department, Edmund H. Hansen The Men in Her Life Columbia Studio Sound Department, John P. Livadary El sergent York Warner Bros. Studio Sound Department, Nathan Levinson Skylark Paramount Studio Sound Department, Loren L. Ryder Topper Returns Hal Roach Studio Sound Department, Elmer A. Raguse 1942 Yankee Doodle Dandy Warner Bros. Studio Sound Department, Nathan Levinson Arabian Nights Universal Studio Sound Department, Bernard B. Brown Bambi Walt Disney Studio Sound Department, Sam Slyfield Flying Tigers Republic Studio Sound Department, Daniel J. Bloomberg Enemics amistosos Sound Service, Inc., Jack Whitney La quimera de l'or RCA Sound, James L. Fields Mrs. Miniver Metro-Goldwyn-Mayer Studio Sound Department, Douglas Shearer Lluna de mel RKO Radio Studio Sound Department, Steve Dunn L'orgull dels ianquis Samuel Goldwyn Studio Sound Department, Thomas T. Moulton Road to Morocco Paramount Studio Sound Department, Loren L. Ryder This Above All 20th Century-Fox Studio Sound Department, Edmund H. Hansen Ballant neix l'amor Columbia Studio Sound Department, John P. Livadary 1943 Aquesta terra és meva RKO Radio Studio Sound Department, Steve Dunn Hangmen Also Die! Sound Service, Inc., Jack Whitney In Old Oklahoma Republic Studio Sound Department, Daniel J. Bloomberg Madame Curie Metro-Goldwyn-Mayer Studio Sound Department, Douglas Shearer The North Starr Samuel Goldwyn Studio Sound Department, Thomas T. Moulton Phantom of the Opera Universal Studio Sound Department, Bernard B. Brown Riding High Paramount Studio Sound Department, Loren L. Ryder Sahara Columbia Studio Sound Department, John P. Livadary Saludos Amigos Walt Disney Studio Sound Department, Sam Slyfield So This Is Washington RCA Sound, James L. Fields The Song of Bernadette 20th Century-Fox Studio Sound Department, Edmund H. Hansen Això és l'exèrcit Warner Bros. Studio Sound Department, Nathan Levinson 1944 Wilson 20th Century-Fox Studio Sound Department, Edmund H. Hansen Brazil Republic Studio Sound Department, Daniel J. Bloomberg Casanova Brown Samuel Goldwyn Studio Sound Department, Thomas T. Moulton Les models Columbia Studio Sound Department, John P. Livadary Double Indemnity Paramount Studio Sound Department, Loren L. Ryder His Butler's Sister Universal Studio Sound Department, Bernard B. Brown Hollywood Canteen Warner Bros. Studio Sound Department, Nathan Levinson It Happened Tomorrow Sound Service, Inc., Jack Whitney Kismet Metro-Goldwyn-Mayer Studio Sound Department, Douglas Shearer Music in Manhattan RKO Radio Studio Sound Department, Steve Dunn A Voice in the Wind RCA Sound, James L. Fields 1945 The Bells of St. Mary's RKO Radio Studio Sound Department, Steve Dunn Algun dia tornaré Republic Studio Sound Department, Daniel J. Bloomberg Lady on a Train Universal Studio Sound Department, Bernard B. Brown Que el cel la jutgi 20th Century-Fox Studio Sound Department, Thomas T. Moulton Rhapsody in Blue Warner Bros. Studio Sound Department, Nathan Levinson A Song to Remember Columbia Studio Sound Department, John P. Livadary The Southerner General Service, Jack Whitney They Were Expendable Metro-Goldwyn-Mayer Studio Sound Department, Douglas Shearer The Three Caballeros Walt Disney Studio Sound Department, Sam Slyfield Three Is a Family RCA Sound, W.V. Wolfe The Unseen Paramount Studio Sound Department, Loren L. Ryder Un home fenomen Samuel Goldwyn Studio Sound Department, Gordon E. Sawyer 1946 The Jolson Story Columbia Studio Sound Department, John P. Livadary Els millors anys de la nostra vida Samuel Goldwyn Studio Sound Department, Gordon E. Sawyer Que bonic que és viure RKO Radio Studio Sound Department, John Aalberg 1947 The Bishop's Wife Samuel Goldwyn Studio Sound Department, Gordon E. Sawyer Green Dolphin Street Metro-Goldwyn-Mayer Studio Sound Department, Douglas Shearer T-Men Sound Service, Inc., Jack Whitney 1948 The Snake Pit 20th Century-Fox Studio Sound Department, Thomas T. Moulton Johnny Belinda Warner Bros. Studio Sound Department, Nathan Levinson Moonrise Republic Studio Sound Department, Daniel J. Bloomberg 1949 Twelve O'Clock High 20th Century-Fox Studio Sound Department, Thomas T. Moulton Once More, My Darling Universal Studio Sound Department, Bernard B. Brown Sands of Iwo Jima Republic Studio Sound Department, Daniel J. Bloomberg

Dècada de 1950