William Gaither Crudup (born July 8, 1968) is an American actor. He is known for supporting roles in films including Almost Famous, Big Fish, Mission: Impossible III, Watchmen, Public Enemies, Spotlight, and Alien: Covenant, as well as lead roles in films including Without Limits, Dedication, and the animated film Princess Mononoke. He appeared in the 2017 superhero film Justice League as Doctor Henry Allen. He has also had an extensive stage acting career, appearing mostly on Broadway. He has been nominated four times for a Tony Award for his acting, and won once, for his role in Tom Stoppard's The Coast of Utopia in 2007. From 1998 to 2005, Crudup was the narrator for "Priceless", a U.S. television ad campaign for MasterCard.
| Movie | The Auction | Scuba Diver #1 | 2027 |
| Movie | Mission: Impossible - The Final Reckoning | Musgrave (archive footage) | 2025-05-17 |
| Movie | Megadoc | Self (archive footage) (uncredited) | 2025-09-19 |
| Movie | Jay Kelly | Timothy | 2025-11-14 |
| Series | Hello Tomorrow! | Jack Billings | 2023-02-16 |
| Movie | The Flash | Henry Allen | 2023-06-13 |
| Movie | Zack Snyder's Justice League | Henry Allen (uncredited) | 2021-03-18 |
| Movie | After the Wedding | Oscar | 2019-08-09 |
| Movie | Where'd You Go, Bernadette | Elgie | 2019-08-16 |
| Series | The Morning Show | Cory Ellison | 2019-11-01 |
| Movie | More Human Than Human | Self | 2018-03-10 |
| Movie | 1 Mile To You | Coach K | 2017-04-07 |
| Movie | From Jackie to Camelot | Self | 2017-03-07 |
| Movie | Youth in Oregon | Brian Gleason | 2017-01-11 |
| Movie | Alien: Covenant | Oram | 2017-05-09 |
| Series | Gypsy | Michael Holloway | 2017-06-30 |
| Movie | Justice League | Henry Allen (uncredited) | 2017-11-15 |
| Movie | Jackie | The Journalist | 2016-12-02 |
| Movie | 20th Century Women | William | 2016-12-28 |
| Movie | The Stanford Prison Experiment | Dr. Philip Zimbardo | 2015-07-17 |
| Movie | Spotlight | Eric Macleish | 2015-11-06 |
| Movie | The Longest Week | Dylan Tate | 2014-09-05 |
| Movie | Glass Chin | J.J. Cook | 2014-04-19 |
| Movie | Rudderless | Sam Manning | 2014-10-17 |
| Movie | Blood Ties | Frank | 2013-08-22 |
| Movie | Thin Ice | Randy | 2012-02-17 |
| Movie | The Watch | Neighbor | 2012-07-26 |
| Movie | Too Big to Fail | Timothy Geithner | 2011-11-25 |
| Movie | Eat Pray Love | Steven | 2010-08-12 |
| Series | Warren the Ape | Unknown | 2010-06-14 |
| Movie | Watchmen | Jon Osterman / Dr. Manhattan | 2009-03-04 |
| Movie | The Phenomenon: The Comic That Changed Comics | Self | 2009-07-21 |
| Movie | Public Enemies | J. Edgar Hoover | 2009-07-01 |
| Movie | Pretty Bird | Curtis Prentiss | 2008-08-08 |
| Movie | Dedication | Henry Roth | 2007-08-24 |
| Movie | Mission: Impossible III | Musgrave | 2006-04-25 |
| Movie | The Good Shepherd | Archibald Cummings | 2006-12-11 |
| Movie | Trust the Man | Tobey | 2005-09-01 |
| Series | The Tony Danza Show | Unknown | 2004-09-13 |
| Movie | Stage Beauty | Ned Kynaston | 2004-09-03 |
| Movie | Big Fish | Will Bloom | 2003-12-04 |
| Movie | World Traveler | Cal | 2002-04-19 |
| Movie | Charlotte Gray | Julien Levade | 2001-12-28 |
| Movie | Waking the Dead | Fielding Pierce | 2000-03-24 |
| Movie | Jesus' Son | FH | 2000-06-16 |
| Movie | Almost Famous | Russell Hammond | 2000-09-15 |
| Movie | Monument Ave. | Teddy | 1998-09-25 |
| Movie | Without Limits | Steve Prefontaine | 1998-09-11 |
| Movie | The Hi-Lo Country | Pete Calder | 1998-12-30 |
| Movie | Grind | Eddie | 1997-04-11 |
| Movie | Inventing the Abbotts | Jacey Holt | 1997-04-04 |
| Movie | Princess Mononoke | Ashitaka (voice) | 1997-07-12 |
| Series | The Daily Show | Unknown | 1996-07-22 |
| Movie | Everyone Says I Love You | Ken | 1996-12-06 |
| Movie | Sleepers | Tommy Marcano | 1996-10-18 |