All 231 actors in both ER and JAG
231 actors have appeared in both ER and JAG, across 558 episodes. The most-credited is Hallee Hirsh, Rachel Greene in ER and Mattie Grace Johnson in JAG.
| Actor | In ER | In JAG | Eps | Eps |
|---|---|---|---|---|
| Hallee Hirsh | Rachel Greene | Mattie Grace Johnson | 14 | 4 |
| Christine Elise | Harper Tracy | CDR Ferraro | 15 | 1 |
| Elizabeth Mitchell | Dr. Kim Legaspi | 1st Lt. Sandra Gilbert | 14 | 1 |
| Paul Collins | Dr. Norm Middleton | SecNav Alexander Nelson | 1 | 14 |
| Harrison Page | Stan | Rear Admiral Stiles Morris, Capt. Stiles Morris | 4 | 10 |
| Demetrius Navarro | Paramedic Morales | Angel Munoz | 53 | 1 |
| Steven Culp | Dave Spencer, Dr. Charles Cameron | Special Agent Clayton Webb | 5 | 8 |
| Andrea Parker | Linda Farrell | Commander Caitlin "Kate" Pike, USN | 10 | 1 |
| Mae Whitman | Heather | Chloe Madison | 1 | 8 |
| Rif Hutton | Mr. Royston | LCDR Alan Mattoni | 1 | 7 |
| Cress Williams | Officer Reggie Moore | Captain Overton | 14 | 1 |
| Laura Putney | Patricia Cox | Catherine Gale | 1 | 5 |
| Isabella Hofmann | AIDS Clinic Doctor | Meredith Cavanaugh | 1 | 4 |
| Matthew Glave | Dr. Dale Edson | LT Jack "Ripper" Carter | 15 | 2 |
| Sean Murray | Bret Logan | Danny Walden | 1 | 3 |
| Tamala Reneé Jones | Joanie Robbins | Nia | 3 | 1 |
| Scott Jaeck | Dr. Steven Flint | Commander Dooley | 12 | 1 |
| Jim Fitzpatrick | Lt. Col. McGreun | Lt. Cmdr. Murray Douglas, Marine Maj. Warren Lasley | 1 | 2 |
| Luck Hari | Lakshmi, OB Nurse | Sahiba Khalili | 2 | 1 |
| Patrick Kilpatrick | Matthew Lindermulder | CAPT Lyle, Kent | 1 | 2 |
| Mike Genovese | Officer Al Grabarsky | Pops Munchak | 12 | 1 |
| Lawrence Monoson | Dean Rollins | Detective Axelrad | 4 | 1 |
| Alex Kapp | Brenda | Radar Operator | 1 | 1 |
| Anne-Marie Johnson | Sickle Cell Patient | Rep. Bobbi Latham | 1 | 3 |
| Biff McGuire | Ralph Pooler | Adm. Caleb Stanton, Ret. | 1 | 1 |
| Conchata Ferrell | Mrs. Jenkins | Deanne MacKenzie | 1 | 1 |
| Michael Alldredge | Ray's Dad | Gunnery Sergeant Krycek | 1 | 1 |
| Michael O'Neill | Col. Ken Kilner | Major General Harold Rossing | 1 | 1 |
| Michelle Wolff | Firefighter Rillo | Air Controller | 1 | 1 |
| Sterling K. Brown | Bob Harris | Sgt. Harry Smith | 1 | 1 |
| Wade Williams | Migraine Guy | Sheriff Brad Driskell | 1 | 1 |
| Scott Paulin | Dr. Kirsch | CAPT Johnson | 1 | 4 |
| Bernard White | Addict seeking Rapid Detox | Sadik Fahd | 1 | 2 |
| Clyde Kusatsu | Review Board Doctor #1 | Senator Theodore Fujiwara, Capt. Morimoto | 1 | 2 |
| Jeffrey Dean Morgan | Firefighter Lorcan | Wally (CIA Technician), Weapons Officer | 1 | 2 |
| Ken Lerner | Harry Stopak, Stan Seidel | James Reid | 2 | 1 |
| Susan Haskell | Mrs. Burke | LCDR Jordan "Jordi" Parker | 1 | 2 |
| Ed Lauter | Fire Captain Dannaker | General Hughes | 6 | 1 |
| John Walcutt | Cancer Specialist | Tom Johnson, Caleb Farmer | 2 | 3 |
| Bonnie Root | Lori | Lt. Sandy Winters | 1 | 1 |
| Carmen Argenziano | Howard Davis | Colonel Matthew O'Hara | 1 | 1 |
| Conor O'Farrell | Richard Abbott | Gen. Nathan Behnke | 2 | 1 |
| David Gianopoulos | John Dean / Bob Halderman | CDR Albert Hocking, Major Aspinal | 1 | 2 |
| Gail Strickland | Dr. Renee Spielman | Ambassador Bartlett | 1 | 1 |
| Glenn Morshower | Rick Decoyte | CPO Ned Bannon, Capt. French | 1 | 3 |
| Jose Yenque | Wardell | Officer John Alcala | 1 | 1 |
| Lee Tergesen | Mr. Mullen | Gunnery Sergeant Gentry | 1 | 1 |
| Mark Moses | Mr. Marks | Deke Carson / Earl Ticktin | 1 | 1 |
| Patrick St. Esprit | Mr. Thorpe | CAG - USS Patrick Henry | 1 | 1 |
| Scott Haven | P.K. Palmer IV | Chief of Chaplains | 1 | 2 |
| Vernée Watson | April Wilson | Annette Dunwoody | 2 | 1 |
| Maury Sterling | Dr. Nelson | Petty Officer Simpkins | 5 | 1 |
| Alan Dale | Al Patterson | Tom Morrow | 3 | 2 |
| Jack Stehlin | Mr. Stevens | Edward Hardy | 1 | 2 |
| Vladimir Skomarovsky | Vladko Doric | Col. Mikhail Parlovsky | 1 | 2 |
| Angela Paton | Mrs. Ransom | Elena Motley | 1 | 1 |
| Christopher Wiehl | Mr. Lattimer | Sgt. Barnes | 1 | 1 |
| Eric Lange | Rod Stillman | Brad Weston | 1 | 1 |
| Jacob Vargas | Diablo | Corporal Cortez | 1 | 1 |
| Jamie Rose | Marilyn Bracken | Liz Holst | 1 | 1 |
| Judith Hoag | Mrs. Brenner | Mildred Evans | 1 | 1 |
| Marcelo Tubert | Galloway | Admiral Picato | 3 | 1 |
| Marjean Holden | Elise Warner | Lieutenant Sanford | 1 | 1 |
| Michael Bowen | Dante Valerio | Denny | 1 | 1 |
| Richard Biggs | Bruce Storchester | Lt. Col. John Swift | 1 | 1 |
| Richard Herd | Dr. Murphy | Charles Hoskins | 1 | 1 |
| Shaun Toub | Butler | Prison Commandant | 1 | 1 |
| Vivian Wu | Janet Wade | Angelique Sonsiri | 1 | 1 |
| Allan Kolman | Ed Minyard | Alexei | 1 | 2 |
| Francesco Quinn | Dr. Alfonso Ramirez | Kabir Atef | 1 | 2 |
| Ilia Volok | Kovalev | Maj. Nikolai | 1 | 2 |
| Michael J. Harney | Mr. Stehly | Barman, Naval Judge | 1 | 2 |
| Scott Williamson | Dr. Lyle Howard | Larry Kaliski | 1 | 2 |
| Danny Mora | Guillermo | Javier Hoyas | 3 | 1 |
| Blayne Weaver | Jeffrey | Private First Class Douglas | 1 | 1 |
| Charles Hoyes | Mr. Cooley | Ernie McGill | 1 | 2 |
| Christopher John Fields | Dr. Phil Tobiason | LCDR Scott | 2 | 1 |
| Daniel Henry Murray | Med Tech | Victor | 1 | 1 |
| Dennis Cockrum | Little League Player's Father | Vic Velasco | 1 | 1 |
| Drew Snyder | Mr. Drane | Judge Talbert | 1 | 1 |
| Duke Stroud | Uncle Liam | Judge Merryweather | 1 | 1 |
| Emilio Rivera | Emilio Cardazco | Drug Runner | 1 | 1 |
| François Chau | Neuro Resident | Kin Ku | 2 | 1 |
| Gregg Henry | Officer Mark Downey | Captain Reed | 1 | 1 |
| Ingo Neuhaus | Cop, McNally | SGT Garret, Staff Sergeant | 2 | 2 |
| Jeff Doucette | Larkowski | Senator Jim | 1 | 1 |
| Joe Marinelli | Joey | Messers | 1 | 1 |
| Jullian Dulce Vida | Gang Shooter | Rodriguez | 1 | 1 |
| Michael Fairman | Mort Harris | CIA Director Norman Watts | 1 | 2 |
| Paul Perri | Monty | Dr. Chataway | 1 | 2 |
| Rick Hall | Detective in Larkin Case | Air Boss | 1 | 2 |
| Sean Christopher Davis | Detective Maskins | Airman Griggs | 1 | 2 |
| Theodore Borders | Joey Paige, Keyshawn | Tyler Hanson | 2 | 1 |
| Tom Schanley | Detective Middleton | CDR Winter | 1 | 1 |
| Tom Simmons | Ethan Brown | Police Officer | 1 | 1 |
| Tom Wright | Wharton | Commander Simon Harriman | 2 | 1 |
| Tony Denison | Detective Patrie | Commander Stefan Stefanopoulos | 1 | 1 |
| Will Rothhaar | Robert "Bo" Borsalino | Josh Pendry | 1 | 1 |
| Benjamin Brown | Cop, Lab Tech | Radar Controller, Stiles | 2 | 2 |
| Bill Bolender | Hank Riley | CAPT "Skipper" Ross | 2 | 2 |
| Lisa Pera | Ella, Yetna | Pitchta | 2 | 1 |
| Valeri Ross | McGillis | Nurse #1 | 4 | 1 |
| Claudette Nevins | Judge | Mrs. Porter Webb | 1 | 1 |
| David Naughton | Ben Stevens | Det. Grady | 1 | 1 |
| Jeff Kober | Stuart | Rory Coulter | 1 | 1 |
| Joanie Fox | Waitress #1 | Reporter #1 | 5 | 1 |
| Larry Sullivan | Martin Pryor | CPO Roger Pearson | 1 | 1 |
| Lou Richards | Perkins | Captain Costain | 1 | 1 |
| Luis Avalos | Pediatrician | Helgado Vargas | 1 | 1 |
| Michael Chieffo | Dr. Harris | Forensics Specialist | 1 | 1 |
| Rosemary Forsyth | Judy | Senator Grace Marion | 1 | 1 |
| Sam Witwer | Tommy | Beasley | 1 | 1 |
| Sara Mornell | Robin Gambrell | Laurie Anderson | 1 | 1 |
| Sondra Currie | Dottie Shroeder | Angela Ritter | 1 | 1 |
| Tim Perez | Julio Ruiz | Corporal Martinez | 1 | 1 |
| Vien Hong | Young Banger | Prisoner | 1 | 1 |
| Wayne Duvall | Umpire | Hobbs | 1 | 1 |
| William Lucking | Kenny Brannigan | Sheriff Stu Pope | 1 | 1 |
| Andy Umberger | Dr. David Harvey | Dr. Pomerantz | 2 | 1 |
| Aysia Polk | Tina Jones | Dar-Lin Lewis | 1 | 1 |
| Betsy Brandt | Franny Myers | Leslie Rosenbaum | 1 | 1 |
| Damara Reilly | Estelle | CAPT Bouchard | 1 | 1 |
| Diane DiLascio | Officer Lisa Kimble | Tina Leigh | 1 | 1 |
| Dom Magwili | Trauma Surgeon | Colonel Patano | 1 | 1 |
| Jody Wood | Mr. Casey | Postal Driver | 1 | 1 |
| Joel McKinnon Miller | Mr. Emerson | Gary Sharps | 1 | 1 |
| Kari Coleman | Mona | Marcy Katz | 1 | 1 |
| Kerrie Keane | Melissa Walker | Commander Lucy Maron | 1 | 1 |
| Nestor Serrano | David Torres, CDC | Captain Berroa | 1 | 1 |
| Peter Haskell | Fred Thunhurst | Ellis Burke | 1 | 1 |
| Richard Cox | Rick Mathers | Mr. Handy | 1 | 1 |
| Rita Zohar | Patient's Wife | Mrs. Minas | 1 | 1 |
| Roger Aaron Brown | Dr. Jared Ames | General Larry Butler | 1 | 1 |
| Ruth Silveira | Chemo Tech Marni | Secretary | 2 | 1 |
| Steve Stapenhorst | Thorn | Judge Lurie | 1 | 1 |
| Thomas Rosales, Jr. | Orderly Enriquez | KO'ed Drug Runner | 2 | 1 |
| Tim Kelleher | U.S. Embassy Official | Lt. Moore | 1 | 1 |
| Troy Ruptash | Dave Fern | Chief Kafenhaus | 1 | 1 |
| Tim Quill | Josh Torren | LT Mason Painter | 1 | 2 |
| Aaron Seville | Dr. Tillman | Admin Officer | 1 | 1 |
| Blue Deckert | Watch Commander | Agent Matlovich | 1 | 1 |
| Brian McGovern | Rob | Sergeant Hart | 1 | 1 |
| Camille Saviola | Margaret | Janet Vitaglianso | 1 | 1 |
| Candice Rose | Firefighter MacPherson | Lt. Isabele Maat | 1 | 1 |
| Charles Cyphers | Injured Civil War Reenactor | Jesse | 1 | 1 |
| Christopher Darga | Wilson | COB | 1 | 1 |
| David O'Donnell | Bill | Petty Officer Riggs | 1 | 1 |
| Geoffrey Rivas | Haven | Hector Valdez | 1 | 1 |
| Isait De La Fuente | Nathan Perez | tbd | 1 | 1 |
| Larry Bagby | Second Reporter | Young Harry Drax | 1 | 1 |
| Martin Grey | Wilbourne | Capt. Eric Miller | 1 | 1 |
| Michael Spound | Dwayne's Father | Lt. Cmdr. Tim Bryant | 1 | 1 |
| Michael Whaley | Mr. Busey | Detective Carlton | 1 | 1 |
| Paige Moss | Amy Stehly | Andrea Granato | 1 | 1 |
| Patti Allison | Motel Manager | Marge | 1 | 1 |
| Sean McGowan | Food Court Guy | PO2 Russ Foyle | 1 | 1 |
| Tom Amandes | David Gardner | CDR John Flagler | 1 | 1 |
| Winston J. Rocha | Officer Eddie Escobar | Mexican Man | 1 | 1 |
| Bruce Nozick | Craig Simon | Seth Maat | 2 | 1 |
| Joan Pringle | Hyams, Josephine | NCIS Agent Mary Holland | 2 | 1 |
| Shashawnee Hall | Detective Ford | Corporal Green | 2 | 1 |
| Allan Wasserman | Mr. Goldstein | CAPT Millstein | 1 | 1 |
| Andrew Hawkes | Hagan | Dale Woodley | 1 | 1 |
| Art Chudabala | Greg | Kwan Kun-An | 1 | 1 |
| David A. Kimball | tbd | President of Court Martial | 1 | 1 |
| David Barrera | Felix Hernandez | Lt. Archuleta | 1 | 1 |
| George Perez | Branch Crockett | Efren Minas | 1 | 1 |
| Gina Gallego | Instructor | Cuban Interpreter | 1 | 1 |
| Jesse Garcia | Carlos Vega | Commander Sloan | 1 | 1 |
| Kimberly Scott | Sandy's Mother | NCIS Agent Lisa Viola | 1 | 1 |
| Michael Yama | Epidemiologist | Judge Furuya | 1 | 1 |
| Peter J. Lucas | Killed Geologist | tbd | 1 | 1 |
| Ramy Zada | Vincent Greco | Prof. Alessandro Selvaggio | 1 | 1 |
| Robert Knott | Donny | Billie | 1 | 1 |
| Susan Enriquez | Teresa Ruiz | Valerie Galindez | 1 | 1 |
| Tom Kiesche | Officer Monroe | Security Guard | 1 | 1 |
| Tom McCafferty | Worker #1 | Lt. Mantei, Panel President | 1 | 2 |
| Shaun Duke | Detective, Painter | Yousif Al-Mutawaf | 2 | 1 |
| Alyson Reed | Ginny | Fran Glass | 1 | 1 |
| Bruce Jarchow | Dr. Hammond | NCIS Agent Grondyke | 1 | 1 |
| Hildy Brooks | Mrs. Devon | Chief Judge Balter | 1 | 1 |
| Ivar Brogger | Deposition Attorney | Commander Brent Tranic | 1 | 1 |
| Joseph Kell | Drunk Driver | Mr. Ravenswood, Mishka's Owner | 1 | 1 |
| Lauri Johnson | Oncology Nurse | Commander | 1 | 1 |
| Richard Tanner | Dad | Capt. Agazi | 1 | 1 |
| Ryan Cutrona | Wilson | General Piper | 1 | 1 |
| Bryan Rasmussen | Robert Martin | Sgt Dutch's Colonel | 2 | 1 |
| Deprece Reddick | Johnston | Andre Biggs | 1 | 1 |
| Henry LeBlanc | Bartender | Captain Jones | 1 | 1 |
| Jack Shearer | Hal Grunwald | George Tennyson | 1 | 1 |
| Jamison Yang | Shuang Tseng | Anesthesiologist | 1 | 1 |
| Jane Daly | Diane Armitage | Lizbeth Rawlings | 1 | 1 |
| Mo Gallini | Guy | Mustafa Al-Jimri | 1 | 1 |
| Ray Baker | Durant | Major General Finstra | 1 | 1 |
| Sharon Madden | Risberg | Mrs. Maars | 1 | 1 |
| Brady Smith | Rod | CPO Reese | 1 | 1 |
| Eric Ware | Cop | SCPO Schilling | 1 | 1 |
| Gretchen Morgan | Mary | Lt. Ormeslan | 1 | 1 |
| Justin Urich | Corky | PO Gandy | 1 | 1 |
| Kimble Jemison | Tom | Officer of the Deck | 1 | 1 |
| Lou Beatty, Jr. | Dexter Jenkins | Captain Imhoff | 1 | 1 |
| Paul Vincent O'Connor | tbd | Army General Zachary Wolfe | 1 | 1 |
| Richard Penn | Dave Donovan | Judge Eberhardt | 1 | 1 |
| Steven Petrarca | Dudzik | Cpl. Peter Maars | 1 | 1 |
| Anne E. Curry | Claire's Mom | Ellen Chaddock | 1 | 1 |
| Carey Van Dyke | Security Guard | Cpl. Liggett | 1 | 1 |
| John Eric Bentley | Larry Anderson | MCPO Calloway | 1 | 1 |
| Kenna Ramsay | Candi | Sonar Technician | 1 | 1 |
| Raynor Scheine | Mr. Garland | R.C. Coffin | 1 | 1 |
| Cindy Lu | Chinese Woman | Young-Hee | 1 | 1 |
| Dwayne Adway | James Reed | Corporal Keely Woods / Lamar Dunwoody | 1 | 1 |
| Harry Karp | Vibrator Guy | Partner | 1 | 1 |
| Kurt Caceres | Luis Sanchez | LT Frank Grady | 1 | 1 |
| Sharon Sharth | Karen Edmunds | Tina | 1 | 1 |
| Chris Babers | Avery Campbell | Toops | 1 | 1 |
| Chuck Walczak | Paramedic | Seaman Sanders | 1 | 1 |
| Giuliana Santini | Kathleen Brant | Francesca Paretti | 1 | 1 |
| Ransford Doherty | Randall James | Private | 1 | 1 |
| Jonathan T. Floyd | Student | Seaman Charles Gaynor | 1 | 1 |
| Kipp Shiotani | Bike Guy | Agent Ito | 1 | 1 |
| Monique Edwards | Callie | Bethesda Nurse | 1 | 1 |
| Noah Blake | Sean | Chief Grisham | 1 | 1 |
| Jay Harik | Seiger | tbd | 1 | 1 |
| Joe Sabatino | Pilot | Mark Borini | 1 | 1 |
| Lucy Vargas | Hispanic Woman | Adelita | 1 | 1 |
| Anne Betancourt | Mrs. Kearney | Muslim Tribunal Member | 1 | 1 |
| Patrick Dollaghan | Officer Tommy | Elling's Commanding Admiral | 1 | 1 |
| Kevin Fry | Detective Demetras | Commander Morton | 1 | 1 |
| Craig Watkinson | Russell | Ordnanceman Louis Cellucci | 1 | 1 |
| Stogie Kenyatta | Bagwell | Lt. Bin Rasheed | 1 | 1 |
| Todd Merrill | Jagman | Presidential Aide | 1 | 1 |
Cast data from TVmaze, licensed CC BY-SA 4.0.