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William Joseph Baldwin (born February 21, 1963) is an American actor and the second-youngest of the four Baldwin brothers. He has starred in the films Flatliners (1990), Backdraft (1991), Sliver (1993), Virus (1999), The Squid and the Whale (2005), Forgetting Sarah Marshall, in which he portrayed himself, and the Netflix show Northern Rescue (2019). Baldwin is married to singer Chynna Phillips.
| Year | Title | Role | Notes |
| 1989 | The Preppie Murder | Robert Chambers | TV movie |
| Born on the Fourth of July | Platoon | ||
| 1990 | Internal Affairs | Officer Van Stretch | |
| Flatliners | Joe Hurley | ||
| 1991 | Backdraft | Brian McCaffrey | |
| 1993 | Three of Hearts | Joe Casella | |
| Sliver | Zeke Hawkins | ||
| 1995 | A Pyromaniac's Love Story | Garett | |
| Fair Game | Detective Max Kirkpatrick | ||
| 1996 | Curdled | Paul Guell | |
| 1998 | Bulworth | Constance Bulworth's Lover | |
| Shattered Image | Brian | ||
| 1999 | Virus | Steve Baker | |
| Brotherhood of Murder | Tom Martinez | TV movie | |
| 2000 | Primary Suspect | Christian Box | |
| Relative Values | Don Lucas | ||
| 2001 | Double Bang | Billy Brennan | |
| One Eyed King | Frankie Thomas | ||
| Say Nothing | Julian Grant | ||
| 2002 | You Stupid Man | Brady | |
| 2003 | Red Rover | Will Taylor | |
| 2004 | Art Heist | Bruce Walker | |
| 2005 | The Squid and the Whale | Ivan | |
| 2006 | Lenexa, 1 Mile | Dan Cooney Sr. | |
| Park | Dennis | ||
| Feel | Nathan | ||
| 2007 | Adrift in Manhattan | Mark Phipps | |
| American Fork | Truman Hope | ||
| A Plumm Summer | Mick Plumm | ||
| Noise | Mayor's Chief of Staff | ||
| 2008 | Forgetting Sarah Marshall | Detective Hunter Rush | |
| 2010 | Justice League: Crisis on Two Earths | Batman (voice) | Video |
| 1 a Minute | Himself | ||
| 2011 | The Craigslist Killer | Detective Bennett | TV movie |
| Jock the Hero Dog | Boatman (voice) | ||
| 2012 | Dino Time | Sarco (voice) | |
| 2013 | Be My Valentine | Dan | TV movie |
| Sexy Evil Genius | Bert Mayfaire | Video | |
| Stranger Within | Robert Moore | ||
| 2014 | The Wisdom to Know the Difference | Dennis | |
| Aftermath | Shane (voice) | ||
| 2015 | Lead With Your Heart | Ben Walker | TV movie |
| Christmas Trade | Mitch Taylor | ||
| 2016 | Chronology | Mr. Rose | |
| Blowtorch | Detective Frank Hogan | ||
| 2017 | While You Were Dating | Nick Stendahl | TV movie |
| Born Again Dead | Haskell | ||
| The Broken Key | Friar Hugo | ||
| Maximum Impact | Man in Shadows |
| Year | Title | Role | Notes |
| 2004–2006 | Danny Phantom | Johnny 13 (voice) | Recurring cast: Season 1, Guest: Season 2-3 |
| 2006 | Waterfront | Paul Brennan | Main cast |
| 2007–2009 | Dirty Sexy Money | Patrick Darling | Main cast |
| 2010 | Parenthood | Gordon Flint | Recurring cast: Season 2 |
| 2010–2012 | Gossip Girl | William Van Der Woodsen | Recurring cast: Season 3-6 |
| 2011–2012 | Hawaii Five-0 | Frank Delano | Recurring cast: Season 2, Guest: Season 3 |
| 2012 | 30 Rock | Lance Drake Mandrell | Episode: "Kidnapped by Danger" |
| Men at Work | Shepard Peters | Episode: "Inventing Milo" | |
| 2013 | Copper | William 'Wild Bill' Eustace | Recurring cast: Season 2 |
| 2014 | Wilfred | Bruce | Episode: "Patterns" |
| 2015 | Forever | Oliver Clausten | Episode: "The Wolves of Deep Brooklyn" |
| Hot in Cleveland | Dane Stevens | Recurring cast: Season 6 | |
| 2016 | Hit the Floor | Jackson Everett | Recurring cast: Season 3 |
| 2017–2019 | MacGyver | Elwood Davis | Recurring cast: Season 2, Guest: Season 3 |
| 2018 | Insatiable | Gordy Greer | Episode: "Banana Heart Banana" |
| The Purge | David Ryker | Recurring cast: Season 1 | |
| Dream Corp, LLC | Dad | Episode: "Can't Touch This" | |
| 2019 | Northern Rescue | John West | Main Cast |
| Too Old to Die Young | Theo | Recurring cast | |
| 2023 | South Wind | Warren | Main cast |
| Year | Title | Role |
| 2015 | A Wing and a Prayer | Narrator |
| 2024 | Americans With No Address | Narrator |
| Year | Awards | Category | Recipient | Outcome |
| 1993 | MTV Movie Awards | MTV Movie Award for Most Desirable Male | Sliver | Won |
| Golden Raspberry Awards | Golden Raspberry Award for Worst Actor | Nominated | ||
| 1995 | Golden Raspberry Awards | Golden Raspberry Award for Worst Screen Couple (shared with Cindy Crawford) | Fair Game | Nominated |
| 2005 | Gotham Independent Film Awards | Gotham Independent Film Award for Best Ensemble Cast | The Squid and the Whale | Won |