All 188 actors in both Cold Case and The X-Files
188 actors have appeared in both Cold Case and The X-Files, across 374 episodes. The most-credited is Mitch Pileggi, Mitch Hathaway (2007) in Cold Case and Assistant Director Walter Skinner in The X-Files.
| Actor | In Cold Case | In The X-Files | Eps | Eps |
|---|---|---|---|---|
| Mitch Pileggi | Mitch Hathaway (2007) | Assistant Director Walter Skinner | 1 | 70 |
| Steven Williams | Ronde Brooks '09 | Mr. X | 1 | 13 |
| Jerry Hardin | Harry Hapgood '09 | Deep Throat | 1 | 11 |
| Nicki Aycox | Christina Rush | Chastity Raines | 11 | 1 |
| Raymond J. Barry | Paul Cooper | Senator Richard Matheson | 8 | 3 |
| Kevin McCorkle | Detective Gil Sherman | Cult Man #2 | 6 | 1 |
| Keith Szarabajka | Deputy Commissioner Patrick Doherty, Patrick Hogan | Anthony Tipet | 5 | 1 |
| Mark Rolston | Ari Gordon | Bud LaPierre, Richard Odin | 4 | 2 |
| Dondre T. Whitfield | Jarrod Jones | Agent | 3 | 1 |
| Susanna Thompson | Diane Yates '10 | Michelle Generoo | 3 | 1 |
| Brent Sexton | Ken Bream (1998) | Gravedigger, Steven Melnick | 1 | 2 |
| John Billingsley | George (2005) | Timothy "Timmy the Geek" Landau | 2 | 1 |
| John Diehl | Isaac Keller | Wilson "Pinker" Rawls | 2 | 1 |
| Silas Weir Mitchell | James Hogan | Dougie | 2 | 1 |
| Arye Gross | Oscar Anderson '81 | Dr. Puvogel | 1 | 1 |
| Dean Norris | Wayne Nelson (1994-2006) | U.S. Marshal Tapia | 1 | 1 |
| Don Swayze | Grant Hall (2007) | Terry Pruit | 1 | 1 |
| Eve Brenner | Johanna Hoffman (2006) | Little Old Lady | 1 | 1 |
| Jack McGee | Bobby McCallister (2006) | Bob Damphouse | 1 | 1 |
| James Handy | Roger Raitt (2005) | Detective Alan Cross | 1 | 1 |
| James Morrison | Carson Finch | Dr. Robert Wieder | 1 | 1 |
| John Pyper-Ferguson | Pete Doyle | Det. John Kresge, Paul | 1 | 3 |
| Lisa Waltz | Melanie Whitley | Lauren Kyte | 1 | 1 |
| Michael Fairman | David Rosen | Jason Nichols | 1 | 1 |
| Michael J. Anderson | Nathaniel 'Biggie' Jones '10 | Mr. Nutt | 1 | 1 |
| Robert LaSardo | Jesus Torres | Cissy Alvarez | 1 | 1 |
| Rodney Rowland | Spencer Mason (2007) | Ed Jerse | 1 | 1 |
| Spencer Garrett | Ben Kern (1983) | Harry Bring | 1 | 1 |
| Stacy Haiduk | Anne Bowen (1984) | Maggie Waterston | 1 | 1 |
| Steve Ryan | Butch Rinaldi | Sheriff Jack Coogan | 1 | 1 |
| Vernée Watson | Belinda Hutchins (2008) | Nurse Whitney Edwards | 1 | 1 |
| W. Earl Brown | Victor Lake | Robert M. Fassl | 1 | 1 |
| Željko Ivanek | John Doe (2006) | Roland Fuller | 1 | 1 |
| Julia Vera | Maria Sanchez (2003) | Mrs. Lana Chee | 1 | 4 |
| Pat Skipper | John Avery | Bill Scully Jr. | 1 | 4 |
| Veronica Cartwright | Mary Ryan | Cassandra Spender | 1 | 4 |
| Fredric Lehne | Sam Royal | Arthur Dales | 1 | 2 |
| Jay Acovone | Tom Collison (2005) | Duffy Haskell, Det. Joe Curtis | 1 | 3 |
| Allison Smith | Simone Gallavan (1978) | Patti | 1 | 1 |
| Bellamy Young | Audrey Metz (1938) | Janet Wilson | 1 | 1 |
| Carl Lumbly | Cordell Baker (2008) | Marcus Duff | 1 | 1 |
| Chris Ellis | Jim Horn (2008) | Sheriff Lance Hindt | 1 | 1 |
| Douglas Smith | Ryan Bayes (1990) | Pitcher | 1 | 1 |
| Ed Lauter | Shep 'Mack' McAvoy '08 | Colonel Marcus Aurelius Belt | 1 | 1 |
| Frances Fisher | Rachel West (2008) | Lizzie Gill | 1 | 1 |
| Geoffrey Lewis | Nathan 'Jonesy' Jones | Alfred Fellig | 1 | 1 |
| George Gerdes | Warden Wilbur | Reverend Calvin Hartley | 1 | 1 |
| Glenn Morshower | Ray Crawford | Aaron Starkey | 1 | 1 |
| Joel McKinnon Miller | Brad Atwater | Deputy Greer | 1 | 1 |
| Judith Scott | Cherise Pierce (2006) | Dr. Kai Bowe | 1 | 1 |
| Justina Vail | Zelda Panay '71 | The Unholy Spirit | 1 | 1 |
| Leon Russom | Owen Murphy (2006) | Detective Miles | 1 | 2 |
| Lynda Boyd | Caroline Dratton | Bar Patron, Elizabeth | 1 | 2 |
| Megan Follows | Maura (2005) | Kath McCready | 1 | 1 |
| Michael Cavanaugh | David Pool (2006) | Sheriff Jack Withers | 1 | 1 |
| Michael McGrady | Greg Barnes | Sheriff Kurt Frey | 1 | 1 |
| Michael Welch | Daniel Potter (1972) | Trevor | 1 | 1 |
| Nestor Serrano | Jaime Reyes | Ken Naciamento | 1 | 1 |
| Patrick Kilpatrick | James 'Monster' Drew '09 | Randall Cooper | 1 | 1 |
| Robert Curtis Brown | Jered Wyatt (1988, 2005) | Assistant DA Damon Kaylor | 1 | 1 |
| Robyn Lively | Miriam Gunden | Angela Schiff | 1 | 1 |
| Sal Landi | Jacob Leonard (2005) | Agent Landau, Nicholas Regali | 1 | 2 |
| Sam Anderson | Ted Robinson | U.S. Attorney Leamus | 1 | 1 |
| Tamara Clatterbuck | Chelsey Simpson '95 | Larina Jackson | 1 | 1 |
| Tara Buck | Kylie | Blueberry | 1 | 1 |
| Tom Virtue | Matthew (1968) | Dave Kline | 1 | 1 |
| Tracy Middendorf | Rebecca Morgan | Gracie | 1 | 1 |
| William Lucking | Tom McCree (2006) | Roky Crikenson | 1 | 1 |
| Colleen Flynn | Emily Simmons (2006) | Colleen Azar, Michele Fazekas | 1 | 2 |
| Gabrielle Miller | Barb Welter '74 | Brenda J. Summerfield, Paula Gray | 1 | 2 |
| Martin Grey | Stu Livermore | Agent Flagler | 1 | 2 |
| Michael B. Silver | Rick | Howard Grodin | 1 | 2 |
| Michael Ensign | Bruce Davies (2008) | Dr. Barnes | 1 | 2 |
| Steven Anderson | David McKinney (2008) | Dr. James Parenti | 1 | 2 |
| Chad Lindberg | Johnny Harkin | Bobby Rich | 1 | 1 |
| Colby French | Seth | Deputy | 1 | 1 |
| Deborah Strang | Julia Chapin | Detective B.J. Morrow | 1 | 1 |
| Jamil Walker Smith | Malik / Theseus (2003 / 2006 / 2007) | Chester Bonaparte | 1 | 1 |
| Jeff Kober | Jack Dubinski | Bear | 1 | 1 |
| Jennifer Hetrick | Lana Wilkes (2008) | Sharon Skinner | 1 | 1 |
| John Aylward | Norman Campbell (2006) | Dr. John Rietz | 1 | 1 |
| John Kapelos | John Butler | Agent Fordyce | 1 | 1 |
| Kate McNeil | Beth Adams (2005) | Nan Wieder | 1 | 1 |
| M.C. Gainey | Coach Walters (2008) | Bo Taylor | 1 | 1 |
| Michael Massee | Kiril | Vernon Ephesian | 1 | 1 |
| Michael O'Neill | Warren Cousins (2005) | Patrol Captain | 1 | 1 |
| Ramon Franco | Ricardo Munoz | Nestor | 1 | 1 |
| Rebecca Wisocky | Alice B. Harris (1919) | Jackie Goldman | 1 | 1 |
| Scott Paulin | Kenneth Yates (2008) | Jeffrey Conlon | 1 | 1 |
| Thomas Kopache | Crumbs (2005) | General Thomas Callahan | 1 | 1 |
| Tom Bower | Curtis Collins (2005) | Sheriff Harden | 1 | 1 |
| Zach Grenier | Ambrose Stone (1919) | Herman Stites | 1 | 1 |
| Jon Gries | Bill Shepard | Salvatore Matola | 2 | 1 |
| Matthew Glave | Carl Bradley (1979) | FBI Prosecutor Kalembrenner | 1 | 2 |
| Patrick St. Esprit | Porter Rawley (2007) | Guard #2 | 1 | 2 |
| Jim Jansen | Dr. Russell Kearns (1963) | Dr. Heitz Werber | 1 | 3 |
| Laura Leigh Hughes | Kelly Witkowski (2005) | Kersh's Assistant | 1 | 3 |
| Warren Sweeney | M.C. (1968) | Dr. Harriman | 1 | 3 |
| Brian Poth | Jimmy Bartram (2007) | Gabe Rotten | 1 | 1 |
| Chad E. Donella | Jeff Kern | Rob Roberts | 1 | 1 |
| Channon Roe | John 'The Doctor' Norwood '63 | Derek Banks | 1 | 1 |
| Conor O'Farrell | Brogan Cooper (1968) | Sheriff Ciolino | 1 | 1 |
| Dale Dickey | Reba Dautry | Game Warden | 1 | 1 |
| Diana Scarwid | Rayanne Leland (1998 / 2008) | Linda Bowman | 1 | 1 |
| Dion Anderson | Dean Lang (2004 | Sheriff Frass | 1 | 1 |
| Erin Chambers | Darcy Curtis '66 | Anna Strong | 1 | 1 |
| Frankie Ingrassia | Donna D'Amico '81 | Cindy Culpepper | 1 | 1 |
| Holmes Osborne | Vincent Hopper | Mark Johnson | 1 | 1 |
| J. Patrick McCormack | Bill Huxley (2006) | Brent Tufeld | 1 | 1 |
| Jamie McShane | Leroy Lambert (1985) | Injured Soldier | 1 | 1 |
| John Mahon | Colonel | General Wegman | 1 | 2 |
| Kerrie Keane | Judy Enright | Nurse | 1 | 1 |
| Mary-Margaret Lewis | Mary Anne Clayton (2007) | Mrs. Dowdy | 1 | 1 |
| Michael Shamus Wiles | Father Andrew Stillman | Black-Haired Man | 1 | 2 |
| Monnae Michaell | Tanya Williams | Female Coroner | 1 | 1 |
| Randy Oglesby | Howard Lang | Reverend Samuel Mackey | 1 | 1 |
| Richard Cox | Clifton Coleman | Daniel Brimley | 1 | 1 |
| Rodney Scott | Scott Swayer | Tony Reed | 1 | 1 |
| Steve Eastin | Carl Welter '10 | Sheriff Mazeroski | 1 | 1 |
| Steven Flynn | David Wyatt '09 | CIA Agent | 1 | 1 |
| Suanne Spoke | Janice Brock | Woman Customer | 1 | 1 |
| McNally Sagal | Janice Warner | Overcoat Woman | 1 | 2 |
| April Grace | Maeve Bubley | Danielle Manley | 1 | 1 |
| Bruce A. Young | Daryl Booker | Pierre Beauvais | 1 | 1 |
| David Bowe | Larry Papas (1977) | Robert Werther | 1 | 1 |
| Dee Freeman | Sammy Robbins | Sergeant Paula Duthie | 1 | 1 |
| Jed Rees | Evan Mazer '10 | Lucas Menand | 1 | 1 |
| Joe Sabatino | Al Walker | Captain Al Triguero | 1 | 1 |
| Lawrence Pressman | Robert "Dobber" Metz (2007) | Mr. Milsap | 1 | 1 |
| Lillian Hurst | Bonita Rafael | Flakita | 1 | 1 |
| Marcus Giamatti | Larry Kenick | John Gillnitz | 1 | 1 |
| Michael Bryan French | Steven (2005) | Paul Mossinger | 1 | 1 |
| Michael Mantell | Ken Westin (2005) | Dr. James Riley | 1 | 1 |
| Paul Vincent O'Connor | Paul Nelson | Warden Brian Hutchinson | 1 | 1 |
| Peter White | JP Valentine (2007) | Gene Gogolak | 1 | 1 |
| Rodney Eastman | Arthur Pool (1945) | Ronald Purnell | 1 | 1 |
| Ron Gilbert | Angelo Romano '58 | Sheriff #2 | 1 | 1 |
| Saxon Trainor | Jane | Mary Hendershot | 1 | 1 |
| Steve Rankin | Lieutenant Wayne Brown | U.S. Marshal Daddo | 1 | 1 |
| Vic Polizos | Lee (2005) | Agent Frank Burst | 1 | 1 |
| Vyto Ruginis | Roy Gardocki | Lieutenant Bianco | 1 | 1 |
| Bob Morrisey | Dr. Ben Breslyn (2007) | Dr. Simon Bruin, Dr. Vinet | 1 | 2 |
| Akiko Morison | Mei Toan | Leza Atsumi | 1 | 1 |
| Dan Desmond | Barnsley | Harry Odell | 1 | 1 |
| Erich Anderson | Dr. Jack Galton | Doug Underwood | 1 | 1 |
| James Otis | Lloyd Jordan (2007) | Arlen Sacks | 1 | 1 |
| Joe Nieves | Manny Hernandez | Barreiro's Son | 1 | 1 |
| Ken Meseroll | David McKinney (1991) | Owen Harris | 1 | 1 |
| Larry Dorf | Ken Westin (1972) | Pathology Assistant | 1 | 1 |
| Lou Beatty, Jr. | Manross Delaney | Coach | 1 | 1 |
| Madison Mason | Maurice Warfield (2005) | Captain Yip Harburg | 1 | 1 |
| Marilyn McIntyre | Suzanne (2005) | Widow | 1 | 1 |
| Michael Rothhaar | Tommy '07 | Dr. Couvillion | 1 | 1 |
| Michael Wiseman | Charles Kozlowzki (2004 / 2006) | Dr. Rocky Bronzino | 1 | 1 |
| Rance Howard | Buddy | Old Man | 1 | 1 |
| Roger Morrissey | Lester 'Gargantuan' Smith '71 | Ubermenscher | 1 | 1 |
| Barry Cullison | Colin Blake '09 | Sheriff Sanchez | 1 | 1 |
| Brian D. Johnson | Rob Dreamer (1983) | Man | 1 | 1 |
| James Sutorius | Reuben Harris '10 | Babcock | 1 | 1 |
| Jeremy Roberts | Burke '09 | George Vincent | 1 | 1 |
| Lombardo Boyar | Cal Acevedo '09 | Deputy Juan Molina | 1 | 1 |
| Mik Scriba | Sonny Carroll (1976) | Lieutenant Kraskow | 1 | 1 |
| Pat Destro | Beth Mills | Joan Scobie | 1 | 1 |
| Ryan Cutrona | Eamon "Big Mac" McCallister | Captain | 1 | 1 |
| Allen Cutler | Clem Garris | Roadblock Officer | 1 | 1 |
| Charles Hoyes | Bobby Lein | Howard Crittendon | 1 | 1 |
| Cheryl White | Nurse Laura Graham (1988, 2005) | Nurse #3 | 1 | 1 |
| Fritz Greve | Chris | Bearded Man | 1 | 1 |
| Jane Daly | Caroline Hargreave '10 | Mrs. Holt | 1 | 1 |
| Mary Kathleen Gordon | Susan Rickter | Woman | 1 | 1 |
| Caryn West | Vicky McGowan (2005) | Dr. Libby Nance | 1 | 1 |
| Chet Grissom | Evan (2005) | Detective | 1 | 1 |
| Dwight Hicks | Opr Super. Bruce Hurt | Prison Armed Guard | 1 | 1 |
| Elayn J. Taylor | Colette (2004) | Nurse #2 | 1 | 1 |
| John Prosky | Dr. Thomas Rabinski | Medical Examiner | 1 | 1 |
| Keith Coulouris | Daniel Patterson (1962) | Intern | 1 | 1 |
| Dylan Kussman | Cliff Burrell (1987) | Med Student | 1 | 1 |
| Luis Villalta | Uniform #1 (1995) | Simon de la Cruz | 1 | 1 |
| Scott Alan Smith | Henry Jones | Prison Doctor | 1 | 1 |
| James Howell | Edward Anthony | Homicide Detective | 1 | 1 |
| Jeff Bowser | Trevor McKai | Redhead Geek | 1 | 1 |
| Mimi Savage | Shelly | Teacher | 1 | 1 |
| Steve Stapenhorst | Andrew Powers '09 | Principal | 1 | 1 |
| Stevie Johnson | Newark Resident | E.M.T. | 1 | 1 |
| Wyatt Smith | Boy (1953) | Baby William | 1 | 1 |
| Bruce Wright | Stewart Adams (1978) | Gary Garber | 1 | 1 |
| Christian Svensson | Leo Koslov '89 | Soldier #2 | 1 | 1 |
| Wiley Pickett | Ed Valentine (1953) | Trooper #2 | 1 | 1 |
Cast data from TVmaze, licensed CC BY-SA 4.0.