Oscar er filmbranchens vigtigste pris. Den uddeles af det amerikanske filmakademi inden for en række kategorier. Oscar-prisen for bedste mandlige birolle (Best Supporting Actor) er blevet uddelt siden 1937 og gives til en skuespiller for en 'enestående præstation' (outstanding performance) i en birolle. Der er fem nominerede skuespillere til prisen hvert år.
Prisen til årets vinder overrækkes almindeligvis af forrige års modtager.
Oscarpriserne uddeles som regel en søndag i februar eller marts, og årstallet nedenfor angiver det år, hvor prisen blev uddelt.
| År | Vinder | Film |
| 2024 | Robert Downey Jr. | Oppenheimer |
| 2023 | Ke Huy Quan | Everything Everywhere All at Once |
| 2022 | Troy Kotsur | CODA |
| 2021 | Daniel Kaluuya | Judas and the Black Messiah |
| 2020 | Brad Pitt | Once upon a Time...in Hollywood |
| 2019 | Mahershala Ali | Green Book |
| 2018 | Sam Rockwell | Three Billboards outside Ebbing, Missouri |
| 2017 | Mahershala Ali | Moonlight |
| 2016 | Mark Rylance | Bridge of Spies |
| 2015 | J.K. Simmons | Whiplash |
| 2014 | Jared Leto | Dallas Buyers Club |
| 2013 | Christoph Waltz | Django Unchained |
| 2012 | Christopher Plummer | Beginners |
| 2011 | Christian Bale | The Fighter |
| 2010 | Christoph Waltz | Inglourious Basterds |
| 2009 | Heath Ledger | The Dark Knight |
| 2008 | Javier Bardem | No Country for Old Men |
| 2007 | Alan Arkin | Little Miss Sunshine |
| 2006 | George Clooney | Syriana |
| 2005 | Morgan Freeman | Million Dollar Baby |
| 2004 | Tim Robbins | Mystic River |
| 2003 | Chris Cooper | Adaptation |
| 2002 | Jim Broadbent | Iris |
| 2001 | Benicio Del Toro | Traffic |
| 2000 | Michael Caine | The Cider House Rules |
| 1999 | James Coburn | Affliction |
| 1998 | Robin Williams | Good Will Hunting |
| 1997 | Cuba Gooding, Jr. | Jerry Maguire |
| 1996 | Kevin Spacey | The Usual Suspects |
| 1995 | Martin Landau | Ed Wood |
| 1994 | Tommy Lee Jones | The Fugitive |
| 1993 | Gene Hackman | Unforgiven |
| 1992 | Jack Palance | City Slickers |
| 1991 | Joe Pesci | Good Fellas |
| 1990 | Denzel Washington | Glory |
| 1989 | Kevin Kline | A Fish Called Wanda |
| 1988 | Sean Connery | The Untouchables |
| 1987 | Michael Caine | Hannah and Her Sisters |
| 1986 | Don Ameche | Cocoon |
| 1985 | Haing S. Ngor | The Killing Fields |
| 1984 | Jack Nicholson | Terms of Endearment |
| 1983 | Louis Gossett, Jr. | An Officer and a Gentleman |
| 1982 | John Gielgud | Arthur |
| 1981 | Timothy Hutton | Ordinary People |
| 1980 | Melvyn Douglas | Being There |
| 1979 | Christopher Walken | The Deer Hunter |
| 1978 | Jason Robards | Julia |
| 1977 | Jason Robards | All the President's Men |
| 1976 | George Burns | The Sunshine Boys |
| 1975 | Robert De Niro | The Godfather Part II |
| 1974 | John Houseman | The Paper Chase |
| 1973 | Joel Grey | Cabaret |
| 1972 | Ben Johnson | The Last Picture Show |
| 1971 | John Mills | Ryan's Daughter |
| 1970 | Gig Young | They Shoot Horses, Don't They? |
| 1969 | Jack Albertson | The Subject Was Roses |
| 1968 | George Kennedy | Cool Hand Luke |
| 1967 | Walter Matthau | The Fortune Cookie |
| 1966 | Martin Balsam | A Thousand Clowns |
| 1965 | Peter Ustinov | Topkapi |
| 1964 | Melvyn Douglas | Hud |
| 1963 | Ed Begley | Sweet Bird of Youth |
| 1962 | George Chakiris | West Side Story |
| 1961 | Peter Ustinov | Spartacus |
| 1960 | Hugh Griffith | Ben-Hur |
| 1959 | Burl Ives | The Big Country |
| 1958 | Red Buttons | Sayonara |
| 1957 | Anthony Quinn | Lust for Life |
| 1956 | Jack Lemmon | Mister Roberts |
| 1955 | Edmond O'Brien | The Barefoot Contessa |
| 1954 | Frank Sinatra | From Here to Eternity |
| 1953 | Anthony Quinn | Viva Zapata! |
| 1952 | Karl Malden | A Streetcar Named Desire |
| 1951 | George Sanders | All about Eve |
| 1950 | Dean Jagger | Twelve O'Clock High |
| 1949 | Walter Huston | The Treasure of the Sierra Madre |
| 1948 | Edmund Gwenn | Miracle on 34th Street |
| 1947 | Harold Russell | The Best Years of Our Lives |
| 1946 | James Dunn | A Tree Grows in Brooklyn |
| 1945 | Barry Fitzgerald | Going My Way |
| 1944 | Charles Coburn | The More the Merrier |
| 1943 | Van Heflin | Johnny Eager |
| 1942 | Donald Crisp | How Green Was My Valley |
| 1941 | Walter Brennan | The Westerner |
| 1940 | Thomas Mitchell | Stagecoach |
| 1939 | Walter Brennan | Kentucky |
| 1938 | Joseph Schildkraut | The Life of Emile Zola |
| 1937 | Walter Brennan | Come and Get It |
Otte skuespillere har modtaget prisen for bedste mandlige birolle mere end én gang. Walter Brennan er den eneste, der har modtaget prisen tre gange.
| Vinder | År |
| Walter Brennan | 1937, 1939, 1941 |
| Mahershala Ali | 2017, 2019 |
| Christoph Waltz | 2010, 2013 |
| Michael Caine | 1987, 2000 |
| Melvyn Douglas | 1964, 1980 |
| Jason Robards | 1977, 1978 |
| Peter Ustinov | 1961, 1965 |
| Anthony Quinn | 1953, 1957 |
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