Alexander Harper "Xander" Berkeley (born December 16, 1955) is an American actor. His roles include George Mason on the television series 24.
| Series | Day One | Unknown | 2026 |
| Movie | Legacy of Screams: The Evolution of Horror Movies | Self - (archive footage) | 2025-11-21 |
| Movie | No Address | Harris | 2025-02-27 |
| Movie | Rust | Blackburn | 2025-05-01 |
| Movie | The Ghost Trap | Maynard | 2024-04-19 |
| Movie | Reagan | George Schultz | 2024-08-29 |
| Movie | Heightened | Gordon | 2023-06-23 |
| Movie | Butcher's Crossing | Charlie Hoge | 2023-02-03 |
| Movie | The Audition | Joel | 2022-10-24 |
| Movie | Alchemy of the Spirit | Oliver | 2022-02-16 |
| Movie | The Wall of Mexico | Michael Rand | 2020-10-13 |
| Movie | The Dark and the Wicked | Priest | 2020-04-16 |
| Movie | Dark Harbor | Priest James | 2019-09-26 |
| Movie | Proud Mary | Uncle | 2018-01-12 |
| Movie | City of Lies | Edwards | 2018-09-06 |
| Movie | Shot | Dr. Roberts | 2017-09-22 |
| Movie | Born Guilty | Mr. Milk | 2017-04-07 |
| Movie | Allegiant | Phillip | 2016-03-09 |
| Movie | Moments of Clarity | Artemis | 2016-09-16 |
| Movie | The Gift | Forrest Bobo | 2015-06-19 |
| Movie | Solace | Mr. Ellis | 2015-09-03 |
| Movie | Transcendence | Dr. Thomas Casey | 2014-04-16 |
| Movie | Small Time | Chick | 2014-04-18 |
| Movie | Son of Batman | Dr. Kirk Langstrom (voice) | 2014-05-13 |
| Series | Salem | Magistrat Hale | 2014-04-20 |
| Movie | This Last Lonely Place | Frank Devore | 2014-04-26 |
| Movie | Louder Than Words | Dr. Lansen | 2013-10-11 |
| Movie | Live at the Foxes Den | Kenneth | 2013-12-06 |
| Movie | That Guy... Who Was in That Thing | Self | 2012-10-11 |
| Movie | Girl Walks Into a Bar | Moe | 2011-03-07 |
| Movie | Seeking Justice | Lieutenant Durgan | 2011-09-02 |
| Series | The Booth at the End | The Man | 2011-07-11 |
| Movie | Five | Peter | 2011-10-10 |
| Movie | Kick-Ass | Detective Gigante | 2010-03-26 |
| Movie | Bedrooms | Harry | 2010-01-01 |
| Movie | Below the Beltway | McMahon | 2010-04-23 |
| Movie | Luster | Detective Carter | 2010-12-12 |
| Series | Nikita | Percival "Percy" Rose | 2010-09-09 |
| Movie | Faster | Sergeant Mallory | 2010-11-23 |
| Series | The Walking Dead | Gregory | 2010-10-31 |
| Movie | Sparks | Sid Harris | 2009-01-16 |
| Movie | The Toe Tactic | Dad | 2009-01-29 |
| Movie | Cook County | Sonny | 2009-03-26 |
| Movie | Superman/Batman: Public Enemies | Captain Atom (voice) | 2009-09-29 |
| Movie | Repo Chick | Father De La Chasse | 2009-09-09 |
| Movie | Year One | King | 2009-06-18 |
| Movie | Women in Trouble | Mr. Frost | 2009-11-13 |
| Movie | Taken | Stuart St. John | 2008-02-18 |
| Series | The Mentalist | Sheriff Thomas McAllister | 2008-09-23 |
| Movie | Seraphim Falls | Railroad Foreman | 2007-01-26 |
| Movie | Fracture | Judge Moran | 2007-04-19 |
| Movie | Magma: Volcanic Disaster | Peter Shepherd | 2006-01-21 |
| Movie | The Garage | Doc Ruppert | 2006-10-12 |
| Movie | Out There | Uncle Doug | 2006-06-10 |
| Series | Jericho | Unknown | 2006-09-20 |
| Series | Medium | Unknown | 2005-01-03 |
| Movie | North Country | Arlen Pavich | 2005-02-12 |
| Movie | Standing Still | Jonathan | 2005-01-02 |
| Series | Criminal Minds | Unknown | 2005-09-22 |
| Movie | Drop Dead Sexy | Harkness | 2005-03-12 |
| Series | Bones | Unknown | 2005-09-13 |
| Movie | Deepwater | Gus | 2005-06-09 |
| Movie | In Enemy Hands | Admiral Kentz | 2004-02-25 |
| Series | Boston Legal | Unknown | 2004-10-03 |
| Series | The Batman | Unknown | 2004-09-11 |
| Series | 100 Scariest Movie Moments | Self | 2004-10-27 |
| Movie | Quicksand | Joey Patterson | 2003-01-08 |
| Movie | The Third Date | Tommy Tulip | 2003-12-31 |
| Series | Karen Sisco | Unknown | 2003-10-01 |
| Series | Teen Titans | Unknown | 2003-07-19 |
| Series | The Court | Unknown | 2002-03-26 |
| Series | The Twilight Zone | Unknown | 2002-09-18 |
| Movie | China: The Panda Adventure | Dakar Johnston | 2001-06-09 |
| Movie | The Man from Elysian Fields | Virgil Koster | 2001-09-13 |
| Series | 24 | George Mason | 2001-11-06 |
| Series | Law & Order: Criminal Intent | Unknown | 2001-09-30 |
| Movie | Storytelling | Mr. DeMarco | 2001-11-08 |
| Movie | Timecode | Evan Wantz | 2000-04-28 |
| Movie | Shanghai Noon | Nathan Van Cleef | 2000-05-26 |
| Series | CSI: Crime Scene Investigation | Unknown | 2000-10-06 |
| Movie | The Cherry Orchard | Yepihodov | 1999-01-01 |
| Series | The West Wing | Unknown | 1999-09-22 |
| Series | Batman Beyond | Unknown | 1999-01-10 |
| Series | Netforce | Bo Tyler | 1999-02-01 |
| Movie | Universal Soldier: The Return | Dr. Dylan Cotner | 1999-08-05 |
| Movie | NetForce | Bo Tyler | 1999-02-01 |
| Movie | The Truth About Juliet | George | 1998-01-01 |
| Movie | Driven | J.D. Johnson | 1998-04-23 |
| Movie | Phoenix | Lt. Clyde Webber | 1998-09-04 |
| Movie | Winchell | Gavreau | 1998-11-21 |
| Series | The Wild Thornberrys | Unknown | 1998-09-01 |
| Movie | Air Force One | Agent Gibbs | 1997-07-25 |
| Movie | Gattaca | Dr. Lamar | 1997-09-07 |
| Movie | The Killing Jar | Danny “Figaretto” Evans | 1997-05-27 |
| Movie | One Night Stand | Charlie's Friend | 1997-11-14 |
| Movie | Amistad | Hammond | 1997-12-10 |
| Movie | Breast Men | Male Interviewer | 1997-12-13 |
| Movie | Barb Wire | Alexander Willis | 1996-05-02 |
| Movie | The Rock | Lonner (uncredited) | 1996-06-07 |
| Movie | Poison Ivy 2: Lily | Donald Falk | 1996-04-26 |
| Series | Nash Bridges | Unknown | 1996-03-29 |
| Movie | Within the Rock | Ryan | 1996-06-08 |
| Movie | A Kidnapping in the Family | Curtis Harrison | 1996-02-26 |
| Movie | A Family Thing | Sunburned Man | 1996-03-29 |
| Movie | Persons Unknown | Tosh | 1996-12-27 |
| Series | Women: Stories of Passion | Jimbo | 1996-08-31 |
| Movie | Apollo 11: First Steps on the Moon | Buzz Aldrin | 1996-11-17 |
| Movie | For Hope | Date #4 (uncredited) | 1996-11-17 |
| Movie | Bulletproof | Gentry | 1996-09-06 |
| Series | Superman: The Animated Series | Unknown | 1996-09-06 |
| Movie | If These Walls Could Talk | John Barrows | 1996-09-11 |
| Series | The Outer Limits | Unknown | 1995-03-26 |
| Movie | Safe | Greg | 1995-06-23 |
| Movie | The Fifteen Minute Hamlet | Shakespeare | 1995-01-01 |
| Movie | Heat | Ralph | 1995-12-15 |
| Movie | Apollo 13 | Henry Hurt | 1995-06-30 |
| Movie | Leaving Las Vegas | Cynical Cabbie | 1995-10-27 |
| Series | Partners | Unknown | 1995-09-11 |
| Series | Duckman | Unknown | 1994-03-05 |
| Movie | Caroline at Midnight | Joey Szabo | 1994-01-26 |
| Movie | Roswell | Sherman Carson | 1994-07-31 |
| Series | Gargoyles | Unknown | 1994-10-24 |
| Series | New York Undercover | Unknown | 1994-09-08 |
| Movie | Attack of the 50 Ft. Woman | Second Man | 1994-09-28 |
| Series | ER | Unknown | 1994-09-19 |
| Series | The Adventures of Brisco County, Jr. | Unknown | 1993-08-27 |
| Movie | Donato and Daughter | Russ Loring | 1993-09-21 |
| Series | The X-Files | Unknown | 1993-09-10 |
| Movie | A Private Matter | Peter Zenner | 1992-06-20 |
| Movie | The Gun in Betty Lou's Handbag | Marchat | 1992-08-21 |
| Movie | Candyman | Trevor Lyle | 1992-10-16 |
| Movie | A Few Good Men | Capt. Whitaker | 1992-12-11 |
| Movie | Deadly Matrimony | Kozolowski | 1992-11-22 |
| Movie | Dillinger | Harry Copeland | 1991-01-06 |
| Movie | Not of This World | Bruce MacNamara | 1991-02-12 |
| Movie | Murder in High Places | Wayne | 1991-06-02 |
| Movie | For the Boys | Roberts, Vietnam | 1991-11-22 |
| Movie | Billy Bathgate | Harvey Preston | 1991-11-01 |
| Movie | Terminator 2: Judgment Day | Todd Voight | 1991-07-03 |
| Movie | The Gumshoe Kid | Monty Griswold | 1990-02-02 |
| Movie | Internal Affairs | Rudy Mohr | 1990-01-12 |
| Movie | The Last of the Finest | Fast Eddie | 1990-03-09 |
| Series | Law & Order | Unknown | 1990-09-13 |
| Movie | The Guardian | Detective | 1990-04-27 |
| Movie | The Grifters | Lt. Pierson | 1990-08-08 |
| Movie | Short Time | Stark | 1990-05-04 |
| Movie | The Rookie | Blackwell | 1990-12-07 |
| Movie | The Fabulous Baker Boys | Lloyd | 1989-10-13 |
| Movie | L.A. Takedown | Waingro | 1989-08-27 |
| Movie | The Verne Miller Story | Cardogan | 1988-06-21 |
| Movie | The Lawless Land | Ez Andy | 1988-01-15 |
| Movie | Deadly Dreams | Jack Torme | 1988-10-26 |
| Movie | Tapeheads | Ricky Fell | 1988-10-21 |
| Movie | Straight to Hell | Preacher McMahon | 1987-06-26 |
| Series | Wiseguy | Unknown | 1987-09-16 |
| Movie | Walker | Byron Cole | 1987-12-04 |
| Movie | Sid and Nancy | Bowery Snax | 1986-09-12 |
| Movie | Omega Syndrome | Yo-Yo | 1986-10-26 |
| Series | The Twilight Zone | Unknown | 1985-09-27 |
| Series | Moonlighting | Unknown | 1985-03-03 |
| Movie | Volunteers | Kent Sutcliffe | 1985-08-16 |
| Series | Miami Vice | Unknown | 1984-09-16 |
| Series | The A-Team | Baker | 1983-01-23 |
| Series | Tales of the Gold Monkey | Unknown | 1982-09-22 |
| Series | Remington Steele | Dan Kowalski | 1982-10-01 |
| Series | Cagney & Lacey | Unknown | 1982-03-25 |
| Movie | Tag: The Assassination Game | Connally | 1982-04-20 |
| Movie | Mommie Dearest | Christopher Crawford | 1981-09-16 |
| Movie | Fire on the Mountain | 1981-11-23 | |
| Series | Falcon Crest | Unknown | 1981-12-04 |
| Series | Hart to Hart | Unknown | 1979-09-22 |
| Series | The Incredible Hulk | Unknown | 1977-11-04 |
| Series | M*A*S*H | Unknown | 1972-09-17 |