All 169 actors in both L.A. Law and The X-Files
169 actors have appeared in both L.A. Law and The X-Files, across 389 episodes. The most-credited is James Pickens, Jr., Joseph Russell in L.A. Law and Deputy Director Alvin Kersh in The X-Files.
| Actor | In L.A. Law | In The X-Files | Eps | Eps |
|---|---|---|---|---|
| James Pickens, Jr. | Joseph Russell | Deputy Director Alvin Kersh | 1 | 22 |
| Jerry Hardin | D.A. Malcolm Gold | Deep Throat | 6 | 11 |
| Sheila Larken | D.A. Deirdre Stackpole | Margaret Scully | 1 | 16 |
| Jennifer Hetrick | Corrinne Hammond | Sharon Skinner | 14 | 1 |
| Michael Fairman | Judge Douglas McGrath | Jason Nichols | 14 | 1 |
| Steven Williams | Detective Sgt. Phipps, Joshua Merrill | Mr. X | 2 | 13 |
| Veronica Cartwright | Margaret Flanagan | Cassandra Spender | 9 | 4 |
| Annie Abbott | Judge Janice L. Neiman, Nita | Older Social Worker | 8 | 1 |
| Charles Cioffi | Judge Robert Lowell | Section Chief Scott Blevins | 1 | 5 |
| Daniel Benzali | Judge Donald Phillips | Colonel Jacob Wharton | 7 | 1 |
| Raye Birk | Judge Steven Lang | Dr. Jeff Eckerle | 7 | 1 |
| Cec Verrell | Angela Sipriano | Lula Phillips | 2 | 1 |
| Fritz Weaver | Dr. Aaron Pierce | Senator Sorenson | 1 | 2 |
| Jack McGee | John Brianson | Bob Damphouse | 2 | 1 |
| James Handy | Attorney Sumner, John Vincent | Detective Alan Cross | 2 | 1 |
| Lindsey Ginter | Mr. Colasurdo | Crew-Cut Man | 1 | 2 |
| Terry O'Quinn | Nick Moats | Lieutenant Brian Tillman, Shadow Man | 1 | 2 |
| Willie Garson | Jay Berg | Henry Weems, Quinton 'Roach' Freely | 1 | 2 |
| CCH Pounder | Judge Roseann Robin | Agent Lucy Kazdin | 4 | 1 |
| Sam Anderson | D.A. Bill Graphia | U.S. Attorney Leamus | 4 | 1 |
| Carl Lumbly | Earl Williams | Marcus Duff | 6 | 1 |
| Andrew J. Robinson | Gregory Edmonson | Dr. Ian Detweiler | 1 | 1 |
| David Groh | Dr. Stephen Harbaugh | Jacob Weiss | 1 | 1 |
| Don Swayze | William Dollar | Terry Pruit | 1 | 1 |
| J.W. Smith | Walt Buckner | Steve | 1 | 1 |
| James Morrison | Walter Phelps | Dr. Robert Wieder | 1 | 1 |
| Maggie Wheeler | Paula Lights | Detective Sharon Lazard | 1 | 1 |
| Raymond J. Barry | Aaron Alner | Senator Richard Matheson | 1 | 3 |
| Stan Shaw | Terry Slueman | Stephen Murdoch | 3 | 1 |
| Susanna Thompson | Susan Alner | Michelle Generoo | 1 | 1 |
| Titus Welliver | William Boyd | Doug Spinney | 1 | 1 |
| Vernée Watson | Wilma Russ | Nurse Whitney Edwards | 1 | 1 |
| Wayne Tippit | Leo Hackett | Detective Thompson | 5 | 1 |
| Željko Ivanek | Joel Lassen | Roland Fuller | 1 | 1 |
| Frederick Coffin | John Shale, Bill Novicky | Section Chief Joseph McGrath | 4 | 1 |
| Julia Vera | Margarita Sanchez | Mrs. Lana Chee | 1 | 4 |
| Pat Skipper | Russ Snyder | Bill Scully Jr. | 1 | 4 |
| Brian Markinson | Steve Gerald | Gary Lambert, Tony Fiore | 1 | 2 |
| Denise Crosby | Joan Turtletaub | Dr. Mary Speake | 1 | 2 |
| Don S. Davis | Judge Richard Bartke | Captain William Scully | 1 | 2 |
| John Diehl | Kevin Delahanty, Tim | Wilson "Pinker" Rawls | 2 | 1 |
| Paul Ben-Victor | Mr. Peters, Sgt. Costellano | Dr. Aaron Monte | 2 | 1 |
| James McDonnell | Dick Berenbaum | Detective Van Allen | 3 | 1 |
| Floyd "Red Crow" Westerman | Judge William Gainser | Albert Hosteen | 1 | 5 |
| Anne DeSalvo | Veronica Berg | Dr. Anne Carpenter | 2 | 1 |
| Barry Primus | Jack Lambert | Robert Dorland | 1 | 1 |
| Bryan Cranston | James Phillips | Patrick Crump | 1 | 1 |
| Christine Estabrook | Susan Parral | Agent Henderson | 1 | 1 |
| Clayton Rohner | Patrick Boyd | Daryl Mootz | 1 | 1 |
| David Wohl | Attorney Walter Resler, Carl Hicks | Kenneth Ungar | 2 | 1 |
| Dion Anderson | Judge Arthur Bryson, Lester Craig | Sheriff Frass | 3 | 1 |
| Erick Avari | Dr. William Harris | Dr. Herb Fountain | 1 | 1 |
| Frances Bay | Marian McConnell | Dorothy | 1 | 1 |
| George Gerdes | Detective Nagy | Reverend Calvin Hartley | 1 | 1 |
| Jason Beghe | Detective Greg Riley | Ranger Larry Moore | 1 | 1 |
| Joe Spano | George Ripley | Mike Millar | 1 | 2 |
| John Towey | Reporter, Male Reporter, Print Reporter | Kenneth Orgel | 5 | 1 |
| Ken Foree | Leonard Mosher | Vincent Parmelly | 1 | 1 |
| Leon Russom | Matthew Wilton | Detective Miles | 1 | 2 |
| Michael Cavanaugh | Paul Richardson | Sheriff Jack Withers | 1 | 1 |
| Nicolas Surovy | Warren Smyth | Dr. Daniel Waterston | 1 | 1 |
| Robert Curtis Brown | Paul Jameson | Assistant DA Damon Kaylor | 1 | 1 |
| Ron Canada | David Ellis | Franklin Potter | 2 | 1 |
| Scott Burkholder | Clark Sims | Agent Kinsley | 1 | 1 |
| Scott Paulin | Alex Jennings, Ben Salter | Jeffrey Conlon | 2 | 1 |
| Stephen McHattie | Gordon Reeve | Red-Haired Man | 1 | 2 |
| Susan Blommaert | Dr. Janice Scheinbaum | Phyllis H. Paddock | 1 | 1 |
| Timothy Carhart | John Harvey | Virgil Incanto | 1 | 1 |
| Dick Anthony Williams | Franklin Hovey, Charles Jackson | Agent Reggie Purdue | 3 | 1 |
| Bernard White | Conrad Peters | Dr. Desai | 2 | 1 |
| Kenneth Tigar | Clarence O'Malley, Mr. McClain | Dr. Plant | 2 | 1 |
| Michael Ensign | Dr. George Leeson | Dr. Barnes | 1 | 2 |
| Randy Oglesby | Dr. Kendall Gratz, Leonard Knipp | Reverend Samuel Mackey | 2 | 1 |
| Stanley Anderson | Dr. Donald Carlson | Agent Lewis Schoniger | 2 | 1 |
| Steven Flynn | Anton D'Arcy, Ellis Agnew | CIA Agent | 2 | 1 |
| Jim Jansen | Geoffrey Bowers, Jerry Manoogian | Dr. Heitz Werber | 2 | 3 |
| Alyson Reed | Joan Dawson | Maggie Lupone | 1 | 1 |
| Angela Paton | Sandra Vosburgh | Mrs. Lukesh | 1 | 1 |
| Deborah Strang | Carol Graf | Detective B.J. Morrow | 1 | 1 |
| Frank Novak | Coroner | Raybert Fellowes | 1 | 1 |
| Gary Grubbs | U.S. Marshal William Hopson | Sheriff Tom Arens | 1 | 1 |
| Graham Jarvis | Dr. Ivan Peretsky | Dr. Austin | 1 | 1 |
| Jack Rader | Patrick Sardo | Ed Meecham | 1 | 1 |
| Leland Orser | Richard Daggett | Jason Ludwig | 1 | 1 |
| M.C. Gainey | Jack Markel | Bo Taylor | 1 | 1 |
| Michael O'Neill | Robert Moran | Patrol Captain | 1 | 1 |
| Micole Mercurio | Mrs. Ferguson | Miss Stodie | 1 | 1 |
| Paul Sand | Headmaster Ted Waldron | Gerd Thomas | 1 | 1 |
| Stephen Hornyak | Kenneth Ellsworth | Dr. Paul Kopeikan | 1 | 1 |
| Thomas Kopache | Dr. Raymond Miles | General Thomas Callahan | 1 | 1 |
| Tom O'Rourke | Harold Stevens | Steve Humphreys | 1 | 1 |
| Wayne Federman | Floor Manager | Wayne Federman | 3 | 1 |
| George Murdock | Sam Wilpod | Elder #3 | 1 | 4 |
| David Purdham | Mr. Pike | Dr. Lev | 1 | 2 |
| John Apicella | Clerk, Stephan Gendler | Greg Pincus | 2 | 1 |
| Marilyn McIntyre | Nadine Greenzaid | Widow | 2 | 1 |
| Suanne Spoke | Cop #2, Officer Goodman | Woman Customer | 2 | 1 |
| Tom O'Brien | Justin Pregerson | Corporal Frish | 1 | 2 |
| Caroline Kava | Mrs. Clark | Doris Kearns | 1 | 1 |
| Dennis Lipscomb | Mr. Belknap | Leonard Vance | 1 | 1 |
| Eric Christmas | Buzz Carr | Stan Phillips | 1 | 1 |
| James Sutorius | Attorney Lyman Hatcher | Babcock | 2 | 1 |
| John Kapelos | Jack Lewis | Agent Fordyce | 1 | 1 |
| Laura Leigh Hughes | Zoe Lazar | Kersh's Assistant | 1 | 3 |
| Lucy Liu | Mei Lin | Kim Hsin | 1 | 1 |
| Marnie McPhail | Amy Slesin | Cami Shroeder | 1 | 1 |
| Miguel Sandoval | Alvaro Campos | Martin Ortega | 1 | 1 |
| Mike Nussbaum | Henry Sutter | Dr. Charles Goldstein | 1 | 1 |
| Mimi Lieber | Sherri Fajed | Anita Fiore | 1 | 1 |
| Richard Cox | Curtis Haber | Daniel Brimley | 1 | 1 |
| Steve Eastin | Sam Hamman | Sheriff Mazeroski | 1 | 1 |
| Tom Jourden | Kevin Anderson | Carlton Chase | 1 | 1 |
| Wayne Duvall | Chris Flanagan | Agent Jerry Lamana | 1 | 1 |
| Arthur Taxier | Dr. Peter Warren | Assistant Director Bart | 2 | 1 |
| Grant Heslov | Andrew Putnam | Dr. Andre Bormanis | 2 | 1 |
| Jonathan Palmer | Guard | Principal | 1 | 2 |
| McNally Sagal | Susan Davies | Overcoat Woman | 1 | 2 |
| Bruce A. Young | Edward Rice | Pierre Beauvais | 1 | 1 |
| Charles Martin Smith | Dale Hardy | Dr. Osbourne | 1 | 1 |
| Dana Gladstone | Dr. Nolan Fuller | Dr. Landon Prince / Dale Gayhart / Harvey William Buchanon / Aaron Baker / James Dickens | 1 | 1 |
| Jon Gries | Dr. Harold Benson | Salvatore Matola | 1 | 1 |
| Lawrence Pressman | Richard Hollis | Mr. Milsap | 1 | 1 |
| Michael Bryan French | Dennis O'Connell | Paul Mossinger | 1 | 1 |
| Peter White | Stanley Silverman | Gene Gogolak | 1 | 1 |
| Steven Barr | Steve | Courier Guard | 1 | 1 |
| Vic Polizos | Al Vogel | Agent Frank Burst | 1 | 1 |
| Bill Lee Brown | Clerk | Mr. Rice | 1 | 1 |
| Brian George | Ollie Jayaraman, Restaurant Chef | Project Doctor | 2 | 1 |
| Byrne Piven | Dr. Kenneth Cahill | Frank Sparks | 1 | 1 |
| George D. Wallace | Judge Peter Brosens | Bertram Mueller | 1 | 1 |
| Madison Mason | Peter Osteen | Captain Yip Harburg | 1 | 1 |
| Michael Rothhaar | Dr. Flynn Patrick | Dr. Couvillion | 1 | 1 |
| Michele Harrell | Judy | Mrs. Murdoch | 1 | 1 |
| Todd Jeffries | City Attorney Larry Martin | Lead Agent Mayfield | 1 | 1 |
| Matthew Glave | Robbie Richards | FBI Prosecutor Kalembrenner | 1 | 2 |
| Stephen Mendel | Judge Harry Martin | Dark-Suited Man #2 | 1 | 2 |
| Don Stewart | Mitchell Nelson | Businessman | 1 | 1 |
| J.T. Walsh | Pete Bostik | Warden Leo Brodeur | 1 | 1 |
| Jan D'Arcy | Judge Lillian Sroge | Judge Kann | 1 | 1 |
| Jeremy Roberts | Officer Walt | George Vincent | 1 | 1 |
| Mark Chaet | Witness | Bank Officer | 1 | 1 |
| Mik Scriba | Guard Bob | Lieutenant Kraskow | 1 | 1 |
| Patience Cleveland | Judge Washington | Arbutus Ray | 1 | 1 |
| Richard McGonagle | Ackley Atwood-Wade | Dr. Francis Orovetz | 1 | 1 |
| Tom Dahlgren | Dr. Warren Chessler | Dr. Irving Thalbro | 1 | 1 |
| Tom Virtue | Rick Nash | Dave Kline | 1 | 1 |
| Wendie Malick | Laura Schoen Russianoff | Assistant Director Maslin | 1 | 1 |
| Jack Shearer | Colonel Kellog | Judge Kinberg | 1 | 1 |
| Jane Daly | Connie | Mrs. Holt | 1 | 1 |
| Paul Willson | Marty Adelstein | Ted | 1 | 1 |
| Philip Lenkowsky | Ira Mytelka | Holy Spirit Man #1 | 1 | 1 |
| Tim Van Pelt | Executive | Young Surgeon | 1 | 1 |
| Cheryl Francis Harrington | Sharon Barrett | E.R. Nurse | 1 | 1 |
| Jacqueline Schultz | Wendy Brussell | Irene McPeck | 1 | 1 |
| Martin Ferrero | Julius Goldbarb | Assassin | 1 | 1 |
| Romy Walthall | Audrey Wilkes | Agent #2 | 1 | 1 |
| Ryan Cutrona | FBI Agent O'Hearn | Captain | 1 | 1 |
| Sheila Shaw | Animal Activist #1 | Marcia Purnell | 1 | 1 |
| John Prosky | Officer Randall Carlson | Medical Examiner | 1 | 1 |
| Maggie Baird | Rachel Malone | Sharon Pearl | 1 | 1 |
| Robert Lipton | Police Sergeant | Head Surgeon | 1 | 1 |
| Arthur Rosenberg | Warren Rawner | Lead Council | 1 | 1 |
| Roz Witt | Foreperson #2 | Night Nurse | 1 | 1 |
| Tony Amendola | Bartender | Cigarette Smoking Pontiff | 1 | 1 |
| Brian Reddy | Eric Simms | Big Fritz | 1 | 1 |
| Gibby Brand | Nelson Quinn | Arthur Gaffin | 1 | 1 |
| John Harnagel | Dr. Kyle Waits | World Weary Dad | 1 | 1 |
| Ralph Meyering, Jr. | Eli Aaronson | Surgeon | 1 | 1 |
| Scott Williamson | Scott Wexler | C.D.C. Leader | 1 | 1 |
Cast data from TVmaze, licensed CC BY-SA 4.0.