| David James Elliott | ... | Cmdr. Harmon 'Harm' Rabb, Jr. / ... (212 episodes, 1995-2005) |
| Catherine Bell | ... | Lt. Col. Sarah 'Mac' MacKenzie / ... (191 episodes, 1996-2005) |
| Patrick Labyorteaux | ... | Lt. Bud Roberts, Jr. / ... (184 episodes, 1995-2005) |
| John M. Jackson | ... | Adm. Albert Jethro 'A.J.' Chegwidden / ... (173 episodes, 1996-2004) |
 | Chuck Carrington | ... | P.O. Jason Tiner / ... (102 episodes, 1997-2003) |
| Karri Turner | ... | Lt. Harriet Sims / ... (81 episodes, 1997-2005) |
| Zoe McLellan | ... | P.O. Jennifer Coates / ... (63 episodes, 2001-2005) |
| Scott Lawrence | ... | Cmdr. Sturgis Turner / ... (57 episodes, 2001-2005) |
| Randy Vasquez | ... | Gunnery Sgt. Victor 'Gunny' Galindez (48 episodes, 1999-2003) |
| Trevor Goddard | ... | Lt. Cmdr. Mic Brumby / ... (42 episodes, 1998-2001) |
| Steven Culp | ... | Special Agent Clayton Webb (41 episodes, 1997-2004) |
| Nanci Chambers | ... | Lt. Loren Singer / ... (40 episodes, 1997-2003) |
| Paul Collins | ... | SecNav Alexander Nelson / ... (32 episodes, 1995-2002) |
| Michael Bellisario | ... | Midshipman Mike 'Mikey' Roberts / ... (29 episodes, 1995-2005) |
| Cindy Ambuehl | ... | Rene Peterson (24 episodes, 2000-2003) |
| Harrison Page | ... | Rear Admiral Stiles Morris / ... (22 episodes, 1997-2003) |
| Jennifer Savidge | ... | Cmdr. Amy Helfman (21 episodes, 2000-2005) |
| Tracey Needham | ... | Lt. j.g. Meg Austin / ... (20 episodes, 1995-1996) |
| Zuhair Haddad | ... | Multiple / ... (20 episodes, 1997-2005) |
| Isabella Hofmann | ... | Meredith Cavanaugh / ... (18 episodes, 2002-2004) |
| Anne-Marie Johnson | ... | Rep. Bobbi Latham / ... (18 episodes, 1997-2002) |
| David Andrews | ... | Maj. Gen. Gordon 'Biff' Cresswell / ... (17 episodes, 2004-2005) |
| Hallee Hirsh | ... | Mattie Grace Johnson (17 episodes, 2003-2005) |
| Rif Hutton | ... | Lt. Commander Alan Mattoni / ... (15 episodes, 1997-2001) |
| Matt Sigloch | ... | MSgt. Tom Androvich / ... (14 episodes, 1995-2005) |
| John DeMita | ... | Col. Clifford Blakely (14 episodes, 2001-2005) |
| W.K. Stratton | ... | Cmdr. Ted Lindsey / ... (13 episodes, 1995-2003) |
| Jade Carter | ... | Sergei Zhukov (12 episodes, 2000-2003) |
| John D'Aquino | ... | Stuart Dunston (11 episodes, 2000-2005) |
| Dean Stockwell | ... | SecNav Edward Sheffield / ... (11 episodes, 2002-2004) |
| Terry O'Quinn | ... | Admiral Thomas Boone / ... (10 episodes, 1995-2002) |
| Jeff MacKay | ... | Big Bud Roberts / ... (10 episodes, 1998-2005) |
| Sibel Ergener | ... | Lt. Elizabeth 'Skates' Hawkes / ... (10 episodes, 1997-2002) |
| Jake Milkovich | ... | A.J. Roberts (10 episodes, 2000-2002) |
| Dana Sparks | ... | Lt. Cmdr. Carolyn Imes / ... (9 episodes, 1997-2003) |
| A.J. Tannen | ... | Lt. Alfred Aldridge (9 episodes, 1999-2001) |
| Chris Beetem | ... | Lt. Gregory Vukovic (8 episodes, 2005) |
| Corbin Bernsen | ... | Captain Owen Sebring / ... (8 episodes, 1999-2004) |
| Mae Whitman | ... | Chloe Madison (8 episodes, 1998-2001) |
| Susan Haskell | ... | Lt. Cmdr. Jordan 'Jordi' Parker (8 episodes, 1998-2001) |
| John Walcutt | ... | Tom Johnson / ... (8 episodes, 2000-2005) |
| Cynthia Sikes | ... | Dr. Sidney Walden / ... (8 episodes, 2000-2001) |
| Matthew Josten | ... | Little A.J. Roberts (8 episodes, 2002-2004) |
| Andrea Thompson | ... | Commander Alison Krennick / ... (7 episodes, 1996-2004) |
| Alexander Kuznetsov | ... | Capt. Alex Volkonov / ... (7 episodes, 1997-2002) |
| Trisha Yearwood | ... | Lt. Cmdr. Teresa Coulter / ... (7 episodes, 1997-2002) |
| Peter Murnik | ... | Clark Palmer / ... (7 episodes, 1997-2001) |
| Larry Poindexter | ... | Dalton Lowne (7 episodes, 1997-1998) |
| Robert Aguilar Jr. | ... | Courtroom Guard / ... (7 episodes, 1999-2002) |
| Scott Paulin | ... | Captain Johnson / ... (7 episodes, 2002-2003) |
| Tamlyn Tomita | ... | Lt. Cmdr. Tracy Manetti (7 episodes, 2002-2003) |
| John Roselius | ... | Admiral Drake / ... (6 episodes, 1995-2002) |
| Rex Linn | ... | Maj. Mark 'Falcon' Sokol / ... (6 episodes, 1995-2000) |
| Claudette Nevins | ... | Mrs. Porter Webb (6 episodes, 1997-2004) |
| Gary Graham | ... | Capt. Tobias Ingles / ... (6 episodes, 1997-2002) |
| Francesco Quinn | ... | Kabir Atef / ... (6 episodes, 1997-2002) |
| Scott Haven | ... | Chief of Chaplains / ... (6 episodes, 1998-2004) |
| Sean Murray | ... | Danny Walden / ... (6 episodes, 1998-2001) |
| Richard McGonagle | ... | Capt. Richard Carey (6 episodes, 2003-2004) |
| Andrea Parker | ... | Lt. Caitlin 'Kate' Pike / ... (5 episodes, 1995-2001) |
| Bernard White | ... | Sadik Fahd / ... (5 episodes, 1996-2004) |
| Guy Garner | ... | CPO Jeb Stuart Wildins / ... (5 episodes, 1996-1997) |
| Glenn Morshower | ... | Chief Petty Officer Ned Bannon / ... (5 episodes, 1995-2000) |
| Daphne Ashbrook | ... | Annie Pendry (5 episodes, 1995-1998) |
| Bill Bolender | ... | Captain 'Skipper' Ross (5 episodes, 1995-1998) |
| Dan Lauria | ... | Allen Blaisdell / ... (5 episodes, 1996-2003) |
| Laura Putney | ... | Catherine Gale (5 episodes, 2002-2003) |
| Bill Cobbs | ... | Chaplain Matthew Turner (4 episodes, 2001-2003) |
| Ben Murphy | ... | Lt. Col. John Farrow / ... (4 episodes, 1997-2004) |
| Ned Vaughn | ... | Captain Rogers / ... (4 episodes, 1996-2004) |
| Shashawnee Hall | ... | Agent Marvin Novack / ... (4 episodes, 1995-2003) |
| Cliff De Young | ... | Chuck DePalma (4 episodes, 1995-1998) |
| Will Rothhaar | ... | Josh Pendry (4 episodes, 1995-1998) |
| Darren Gray Ward | ... | Connors / ... (4 episodes, 1995-1997) |
| Steven Anderson | ... | Assistant Secretary of the Navy David Bair / ... (4 episodes, 1996-2003) |
| John Prosky | ... | Jon Barrow / ... (4 episodes, 1997-2004) |
| Mark Costello | ... | Commander Onclay / ... (4 episodes, 1997-2002) |
| Michael Saad | ... | Gen. Hasan Abdullah / ... (4 episodes, 1997-2002) |
| Vladimir Skomarovsky | ... | Col. Mikhail Parlovsky / ... (4 episodes, 1997-1998) |
| David Ackert | ... | Wahib Shawaf / ... (4 episodes, 1998-2003) |
| Ron Sanchez | ... | Baltimore Cop / ... (4 episodes, 1998-2003) |
| Sam Hennings | ... | Capt. Huddleston / ... (4 episodes, 1998-2001) |
| Giuliana Santini | ... | Francesca Paretti (4 episodes, 1998) |
| Chas. Floyd Johnson | ... | Dr. Bruce Gasden (4 episodes, 1999-2005) |
| Patrick St. Esprit | ... | Col. Bootney / ... (4 episodes, 1999-2005) |
| Mylan Janoplis | ... | Insurgent / ... (4 episodes, 2002-2005) |
| Alex Dodd | ... | Sadik's Henchman / ... (4 episodes, 2002-2003) |
| Jameson Parker | ... | Deputy Director Harrison Kershaw (4 episodes, 2003-2004) |
| Montel Williams | ... | Lt. Curtis Rivers (3 episodes, 1997-2000) |
| Jack Stehlin | ... | Edward Hardy (3 episodes, 2003) |
| Larry Manetti | ... | Andy Kochifos / ... (3 episodes, 1997-2004) |
| Nynno Ahli | ... | Disbursing Officer / ... (3 episodes, 1998-2001) |
| Joe Michael Burke | ... | PO Jeffery Massuco / ... (3 episodes, 1995-2002) |
| Jeffrey Dean Morgan | ... | Wally - CIA Technician / ... (3 episodes, 1995-2002) |
| Oliver North | ... | Ollie (3 episodes, 1995-2002) |
| Steve Rankin | ... | Adm. Mark Tucci / ... (3 episodes, 1995-2002) |
| Joel Bennett | ... | Capt. Bradley / ... (3 episodes, 1995-2001) |
| Bill Clinton | ... | Himself (3 episodes, 1995-1999) |
| Vincent Riotta | ... | Ambassador Moshak / ... (3 episodes, 1995-1998) |
| Scott Jaeck | ... | Commander Dooley (3 episodes, 1995-1996) |
| Nicholas Kadi | ... | Capitain Suhare / ... (3 episodes, 1995-1996) |
| Tim Quill | ... | Lieutenant Mason Painter / ... (3 episodes, 1995-1996) |
| Rich Whiteside | ... | CATCC Officer / ... (3 episodes, 1995-1996) |
| Rick Pasqualone | ... | Lieutenant Kyle / ... (3 episodes, 1996-2005) |
| Jack Conley | ... | Cmdr. Bob Stanich / ... (3 episodes, 1996-2004) |
| Todd Kimsey | ... | Chief Boatswain's Mate / ... (3 episodes, 1996-2004) |
| Tim Lounibos | ... | Lt. Peter Yuen / ... (3 episodes, 1996-2002) |
| Benjamin Brown | ... | Lt. Mirvis / ... (3 episodes, 1996-2001) |
| James MacDonald | ... | StSgt. Timothy Mallory / ... (3 episodes, 1997-2004) |
| Steve Monroe | ... | Lance Corporal Sibley / ... (3 episodes, 1997-2003) |
| Kris Iyer | ... | Lt. Cmdr. Murphy / ... (3 episodes, 1997-2002) |
| Leon Russom | ... | Captain Gayle Osbourne / ... (3 episodes, 1997-2002) |
| David Purdham | ... | Capt. Ray Hubbard (3 episodes, 1997-2001) |
| Larry Bagby | ... | Security Guard (3 episodes, 1997-2000) |
| Darin Cooper | ... | Young Lt. Tom Boone / ... (3 episodes, 1997-2000) |
| Matthew Sutherland | ... | Marine Sergeant / ... (3 episodes, 1997-2000) |
| Mitchell Thomas Gibney | ... | Alfred / ... (3 episodes, 1997-1998) |
| Eric Whitmore | ... | Dr. Nichols / ... (3 episodes, 1997-1998) |
| Loryn Locklin | ... | Jill Waddington (3 episodes, 1998-2004) |
| David Starwalt | ... | Manager of Interment / ... (3 episodes, 1998-2003) |
| Allan Kolman | ... | Alexei (3 episodes, 1998-2000) |
| Kent McCord | ... | Capt. Henry Delario / ... (3 episodes, 1998-2000) |
| Raymond O'Keefe | ... | Gen. Krylov / ... (3 episodes, 1998-2000) |
| Christina Pickles | ... | Trish / ... (3 episodes, 1998-2000) |
| Ray Buktenica | ... | Art Scherer (3 episodes, 1998-1999) |
| Jeff Doucette | ... | Senator Jim / ... (3 episodes, 1999-2005) |
| Brixton Karnes | ... | Cmdr. Bates / ... (3 episodes, 1999-2004) |
| Tom Amandes | ... | Cmdr. John Flagler (3 episodes, 1999-2002) |
| Adam Beason | ... | Captain Rayburn / ... (3 episodes, 1999-2001) |
| Seth Jaffe | ... | Colonel Warren / ... (3 episodes, 1999-2001) |
| Joan Pringle | ... | Agent Mary Holland (3 episodes, 1999-2001) |
| David Quane | ... | Seahawk Pilot / ... (3 episodes, 1999-2001) |
| Mark Metcalf | ... | Capt. Pike (3 episodes, 1999) |
| Dylan Neal | ... | Lt. Dalton 'Boomer' Jonas (3 episodes, 1999) |
| Aysia Polk | ... | Dar-Lin & Annie Lewis / ... (3 episodes, 1999) |
| Mario Schugel | ... | Lt. 'Tuna' Medwick (3 episodes, 1999) |
| Stephen Markle | ... | Kevin Lee / ... (3 episodes, 2000-2004) |
| An Le | ... | Tam (3 episodes, 2000-2003) |
| François Chau | ... | Gen. Shin Wa Chen / ... (3 episodes, 2000-2001) |
| Shaw Jones | ... | Marine Sergeant / ... (3 episodes, 2000-2001) |
| Matthew Sullivan | ... | XO (3 episodes, 2000-2001) |
| Scott Williamson | ... | Larry Kaliski (3 episodes, 2000-2001) |
| Laurence Lau | ... | Dr. Lawrence Gettis (3 episodes, 2000) |
| Derek Webster | ... | Capt. Stanley Ellis / ... (3 episodes, 2001-2005) |
| Ned Schmidtke | ... | Congressman Fetzer / ... (3 episodes, 2001-2004) |
| Tom Jay Jones | ... | Navy Captain / ... (3 episodes, 2001-2003) |
| Lyman Ward | ... | Maj. Gen. Chad Kubin / ... (3 episodes, 2001-2003) |
| Tom McCafferty | ... | Panel President / ... (3 episodes, 2001) |
| Anthony John Denison | ... | CAG USS Coral Sea / ... (3 episodes, 2002-2005) |
| Mary Page Keller | ... | Beth O'Neil / ... (3 episodes, 2002-2003) |
| Crystal Carson | ... | Cmdr. Carpenter (3 episodes, 2002) |
| Craig Kirkwood | ... | Cpl. Sean Stiles (3 episodes, 2002) |
| Vicellous Reon Shannon | ... | Midshipman Kevin Dupree (3 episodes, 2003-2004) |
| Jesse Blanco | ... | Sadik's Guard (3 episodes, 2003) |
| Faran Tahir | ... | Amad Bin Atwa / ... (3 episodes, 2003) |
| Adria Tennor | ... | Laurie June (3 episodes, 2004) |
| Meta Golding | ... | Lt. Tali Mayfield (3 episodes, 2005) |
| Jordana Spiro | ... | Navy Lt. Catherine Graves (3 episodes, 2005) |
| Kevin Dunn | ... | Admiral Al Brovo, JAG / ... (2 episodes, 1995) |
| Andrew A. Rolfes | ... | Chief Inspector Dooseman / ... (2 episodes, 1995-2004) |
| Al Sapienza | ... | Maj. Satelino / ... (2 episodes, 1997-2002) |
| Del Zamora | ... | Capt. José Molina (2 episodes, 2003) |
| Brien Perry | ... | Cowboy / ... (2 episodes, 1997-1998) |
| Michael O'Neill | ... | Cmdr. Bradley / ... (2 episodes, 1999-2005) |
| John Wesley Shipp | ... | Colonel Marcus Sutter / ... (2 episodes, 1995-2004) |
| Erica Gimpel | ... | Varese Chestnut (2 episodes, 2003-2004) |
| Jay Acovone | ... | Col. Harry R. Presser / ... (2 episodes, 2001-2004) |
| Wayne Duvall | ... | Hobbs / ... (2 episodes, 1995-2005) |
| Chuck DeCaro | ... | Himself / ... (2 episodes, 1995-2004) |
| Spencer Garrett | ... | Captain Andrew Stotler / ... (2 episodes, 1995-2004) |
| David Gianopoulos | ... | Cmdr. Albert Hocking / ... (2 episodes, 1995-2004) |
| Jess King | ... | Marine Cptn. / ... (2 episodes, 1995-2004) |
| Joseph Hodge | ... | Merchant Seaman / ... (2 episodes, 1995-2003) |
| Philip J. Martin | ... | Bartender (2 episodes, 1995-2002) |
| Dean Norris | ... | Air Boss 1995 / ... (2 episodes, 1995-2002) |
| Dale Dye | ... | Col. Bill Cobb / ... (2 episodes, 1995-1998) |
| Sara Mornell | ... | Laurie Anderson / ... (2 episodes, 1995-1998) |
| Natasha Pavlovich | ... | Lieutenant Dumai / ... (2 episodes, 1995-1998) |
| Francia Dimase | ... | Lieutenant Tess McKee (2 episodes, 1995-1997) |
| Travis Fine | ... | Chief Petty Officer Grisham / ... (2 episodes, 1995-1997) |
| Tim Grimm | ... | Commander Dale Bishop (2 episodes, 1995-1997) |
| Victor Touzie | ... | Corporal Yusuf / ... (2 episodes, 1995-1997) |
| Richard Crenna | ... | Harm's Dad / ... (2 episodes, 1995-1996) |
| Jesse Henecke | ... | Squad Leader (2 episodes, 1995-1996) |
| Ferdinand Carangelo | ... | Luigi (2 episodes, 1995) |
| Steve Fitchpatrick | ... | Lieutenant Zane Lubin / ... (2 episodes, 1995) |
| Matthew Glave | ... | Lt. Jack 'Ripper' Carter (2 episodes, 1995) |
| Raye Hollitt | ... | Lieutenant Cassie 'Lobo' Fuller / ... (2 episodes, 1995) |
| Gil Johnson | ... | Seaman (2 episodes, 1995) |
| Jay Leno | ... | Himself (2 episodes, 1995) |
| Gregory McKinney | ... | Lieutenant Keeter Jenkins / ... (2 episodes, 1995) |
| Todd Merrill | ... | Presidental Aide (2 episodes, 1995) |
| John Mossman | ... | Crew Chief (2 episodes, 1995) |
| Katherine Olsen | ... | Female Aide (2 episodes, 1995) |
| Kane Picoy | ... | Lieutenant Mace / ... (2 episodes, 1995) |
| Clayton Prince | ... | 'Buster' Williams (2 episodes, 1995) |
| Katie Rich | ... | Lieutenant Angela Arutti / ... (2 episodes, 1995) |
| Joe Sabatino | ... | Mark Borini (2 episodes, 1995) |
| Gregory Vignolle | ... | 'Zapper' Luce (2 episodes, 1995) |
| Tzi Ma | ... | Admiral Lutarno / ... (2 episodes, 1996-2005) |
| Robert Curtis Brown | ... | Field Commander / ... (2 episodes, 1996-2004) |
| David Chisum | ... | P.O. Dott / ... (2 episodes, 1996-2003) |
| James Denton | ... | Geoffrey Roizman / ... (2 episodes, 1996-2003) |
| Mark Kiely | ... | Lieutenant Lamm / ... (2 episodes, 1996-2003) |
| Stan Kirsch | ... | Ensign Frank Cody / ... (2 episodes, 1996-2001) |
| Jordan Marder | ... | Captain Prouse / ... (2 episodes, 1996-2001) |
| Julie Caitlin Brown | ... | Sergeant Carrington (2 episodes, 1996-2000) |
| Drew Ebersole | ... | PO Hamill / ... (2 episodes, 1996-2000) |
| William Lucking | ... | Harry Drax / ... (2 episodes, 1996-2000) |
| Jack Shearer | ... | Captain Underwood / ... (2 episodes, 1996-1999) |
| Lucas Dudley | ... | Co-Pilot / ... (2 episodes, 1996-1998) |
| Barry Jenner | ... | Captain Evans / ... (2 episodes, 1996-1998) |
| Ben Lemon | ... | Cmdr. Holbarth / ... (2 episodes, 1996-1998) |
| Michael McGrady | ... | Lieutenant Commander Jack Keeter / ... (2 episodes, 1996-1998) |
| Aki Aleong | ... | Colonel Yang Chee / ... (2 episodes, 1996-1997) |
| Bobby Hosea | ... | Chief Petty Officer Shipp / ... (2 episodes, 1996-1997) |
| Harry Hutchinson | ... | Intern / ... (2 episodes, 1996-1997) |
| Ingo Neuhaus | ... | Sergeant Garret / ... (2 episodes, 1996-1997) |
| Christopher Curry | ... | Captain Dykstra (2 episodes, 1996) |
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