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The Online Film Critics Society Award for Best Supporting Actor is an annual film award given by the Online Film Critics Society to honor the best supporting actor of the year.
| Year | Winner | Film | Role |
|---|---|---|---|
| 1997 | Burt Reynolds | Boogie Nights | Jack Horner |
| Rupert Everett | My Best Friend's Wedding | George Downes | |
| Anthony Hopkins | Amistad | John Quincy Adams | |
| 1998 | Billy Bob Thornton | A Simple Plan | Jacob Mitchell |
| Ed Harris | The Truman Show | Christof | |
| Jason Patric | Your Friends & Neighbors | Cary | |
| 1999 | Haley Joel Osment | The Sixth Sense | Cole Sear |
| Wes Bentley | American Beauty | Ricky Fitts | |
| Michael Clarke Duncan | The Green Mile | John Coffey | |
| John Malkovich | Being John Malkovich | John Horatio Malkovich | |
| Christopher Plummer | The Insider | Mike Wallace |
| Year | Winner | Film | Role |
|---|---|---|---|
| 2020 | Leslie Odom Jr. | One Night in Miami... | Sam Cooke |
| Sacha Baron Cohen | The Trial of the Chicago 7 | Abbie Hoffman | |
| Chadwick Boseman | Da 5 Bloods | "Stormin'" Norman Earl Holloway | |
| Bill Murray | On the Rocks | Felix Keane | |
| Paul Raci | Sound of Metal | Joe | |
| 2021 | Kodi Smit-McPhee | The Power of the Dog | Peter Gordon |
| Mike Faist | West Side Story | Riff | |
| Ciarán Hinds | Belfast | Pop | |
| Troy Kotsur | CODA | Frank Rossi | |
| Jeffrey Wright | The French Dispatch | Roebuck Wright | |
| 2022 | Ke Huy Quan | Everything Everywhere All At Once | Waymond Wang |
| Barry Keoghan | The Banshees of Inisherin | Dominic Kearney | |
| Brendan Gleeson | Colm Doherty | ||
| Brian Tyree Henry | Causeway | James | |
| Paul Dano | The Fabelmans | Burt Fabelman | |
| 2023 | Robert Downey Jr. | Oppenheimer | Lewis Strauss |
| Robert De Niro | Killers of the Flower Moon | William King Hale | |
| Ryan Gosling | Barbie | Ken | |
| Charles Melton | May December | Joe Yoo | |
| Mark Ruffalo | Poor Things | Duncan Wedderburn |