All 104 actors in both Hart to Hart and Magnum, P.I.
104 actors have appeared in both Hart to Hart and Magnum, P.I., across 272 episodes. The most-credited is Kathleen Lloyd, Peggy Mullen in Hart to Hart and Assistant D.A. Carol Baldwin, Bridget Archer in Magnum, P.I..
| Actor | In Hart to Hart | In Magnum, P.I. | Eps | Eps |
|---|---|---|---|---|
| Kathleen Lloyd | Peggy Mullen | Assistant D.A. Carol Baldwin, Bridget Archer | 1 | 21 |
| Soon-Tek Oh | Lang Chen Cheng | General Nguyen Hue, Dr. Bill Su / Dr. Ling, Sato | 1 | 5 |
| John Hillerman | Victor Sutter | Father Paddy McGuinness, Don Luis Mongueo, Elmo Ziller | 1 | 4 |
| Lyman Ward | Lt. Draper | Frank Foley | 4 | 1 |
| Shelley Smith | Marina Belson, Susy Jensen | Melissa Wainwright, Peggy Armbruster | 2 | 2 |
| Christine Belford | Niki Stephanos, Victoria Dickenson | Adelaide Malone | 2 | 1 |
| Denny Miller | Trammel | FBI Agent Longdon, Ox | 1 | 2 |
| Elaine Joyce | Marilyn, Roberta "Bob" Hayword | Marina Pepesco | 2 | 1 |
| Gregory Sierra | Eduardo, Howard Castle | Miguel Torres | 2 | 1 |
| Henry Darrow | Inspector Correa, Rodriguez | Will Kenikowa | 2 | 1 |
| Paxton Whitehead | Gordon Chumley, Patrick Burke | William Troubshaw | 2 | 1 |
| Richard Johnson | Alex Constantine | Brigadier General Alistair Ffolkes | 1 | 2 |
| Lee De Broux | Conway, Harold Reese | Duffy, Gallagher, Rodney Radcliff | 2 | 3 |
| Anthony Newley | Tony Vacarro | Peter Riddley-Smythe | 1 | 1 |
| Beverly Garland | Real Grandma | Florence Russell | 1 | 1 |
| Carole Cook | Christine | Sarah Tate | 1 | 1 |
| Cesar Romero | Dr. Villac | Doc Villoroch | 1 | 1 |
| Cesare Danova | Noel Teppman | President Manuel Ebenez | 1 | 1 |
| Charles Lucia | Ronnie Cass | Coast Guard Lieutenant | 1 | 1 |
| Cynthia Sikes | Roseanne | Lauren Henderson | 1 | 1 |
| Jane Merrow | Margret Chumley | Vivian Brock Jones | 1 | 1 |
| Jared Martin | Dr. Kellin | Arthur Houston | 1 | 1 |
| Jean Claudio | Hotel Manager | The Marquis | 1 | 1 |
| John Ireland | Zeke Baillinger | Wyndom Jackson | 1 | 1 |
| Michael Halsey | Tommy McQuater | Justin Chesum | 1 | 1 |
| Mimi Rogers | Robin Wall | Margo Perina | 1 | 1 |
| Pat Hingle | Duffy / Ambrose | Garwood Huddle | 1 | 1 |
| Patrick Macnee | Matthew Grade | David Worth / Chee / Chinese Doctor | 1 | 1 |
| Samantha Eggar | Jillian Rawlings | Laura Bennett | 1 | 1 |
| Thaao Penghlis | Assad | Phillipe Fabre Dumout | 1 | 1 |
| George Cheung | Jimmy Lee, Ling | Choi, Kanki's Nephew, Victor Ching | 2 | 3 |
| Dick O'Neill | Lt. Warren | Harry MacKenzie | 2 | 1 |
| James Luisi | Damian Troy, McGarity | John Walter Costa | 2 | 1 |
| Julie Cobb | Scotty McClain | Karen | 1 | 2 |
| Robert Phalen | Benny Petulsky, Bill Westfield | Michaels | 2 | 1 |
| Ina Balin | Jae Turner | Lila, Professor Martinez | 1 | 3 |
| John Calvin | Sam Henderson | Arthur Wainwright, Gary, Nick | 1 | 3 |
| Louise Fitch | Mrs. Deutch, Pasadena Matron | Mrs. Ballard, Wanda Barton | 2 | 2 |
| Tim Rossovich | Blake, Larry | Hank, Nelson | 2 | 2 |
| Tommy Fujiwara | Richard Hashimoto | Dr. Komia in Hospital, Dr. Makudo, Hiramoto | 1 | 4 |
| Carlos Romero | Doctor, Emil Herrera | Grady Walker | 2 | 1 |
| Carolyn Seymour | Celeste Dumont | Elizabeth, Lady Ashley, Leeann | 1 | 3 |
| Claudette Nevins | Senora Piranda | Phyllis Reardon | 1 | 1 |
| Clive Revill | Zabin | Inky | 1 | 1 |
| Dana Wynter | Sylvia Van Upton | Olivia Ross, Velma Troubshaw | 1 | 2 |
| David Palmer | Captain Ellsworth | Elderly Man, Fred Sorenson, Mr. Halliburton | 1 | 4 |
| David Spielberg | Thomas Crawford | Dan Morgan / Inspector Vittorio Mono | 1 | 1 |
| Greg Mullavey | Lester Quillan | Charlie Amos | 1 | 1 |
| Jack Kruschen | Harry Fulterman | Doheny's Partner | 1 | 1 |
| James Hong | Holy Man | Han | 1 | 1 |
| Jameson Parker | Whitney Rogers | A.J. Simon | 1 | 1 |
| John McCook | Damian / Dr. Porter | Prince Roland Martine | 1 | 1 |
| John McLiam | Dr. Emmett Whittlock | Johnnie Wells | 1 | 1 |
| John McMartin | Cole Morefield | Bill Campbell, Jason Bryan | 1 | 2 |
| Joshua Bryant | Dan Wilmott, Paul Villon | Keeler | 2 | 1 |
| Kenneth Mars | Dr. Cobb | Archie, Joseph | 1 | 2 |
| Kenneth Tigar | Baldwin, Harold Ashby | Milton 'The Ripper' Collins | 2 | 1 |
| Lynn Wood | Moderator | Mrs. Finch | 1 | 1 |
| Nicolas Coster | Fred Brunis | Andrew MacKenzie | 1 | 1 |
| Pat Corley | Monty | Dennis MacKenzie | 1 | 1 |
| Paul Verdier | Jean-Claude | Jean Claude Fornier | 1 | 2 |
| Peter Brown | Ray Martin / Dr. Scott | Robert Brighton | 1 | 1 |
| Robert Tessier | Mover #1 | Murderer | 1 | 1 |
| Ronald Hunter | Lt. Hucko | Emmet Donner | 1 | 1 |
| Ronald Lacey | Inspector Michelot | Arthur Hayes | 1 | 1 |
| Roy Dotrice | Courtney Peterson | Harcourt | 1 | 1 |
| Stewart Moss | Larry Merkin, Lee Blair | David Clark | 2 | 1 |
| William Lucking | Vince | Sam Houston Hunter | 1 | 1 |
| George Innes | King Rashid | David Billingsworth | 1 | 2 |
| James Edgcomb | Policeman | Ed Kanfer, Phil Lewis | 1 | 2 |
| Simone Griffeth | Pamela Granville, Susan Stockwood | Alex McPort / FBI Agent Alex Karnes | 2 | 1 |
| Amanda McBroom | Blair Craddock | Country Singer | 1 | 1 |
| Arlen Dean Snyder | Fred | Mr. Shelby | 1 | 1 |
| Burr DeBenning | Taggert | Ed Russler | 1 | 1 |
| Chuck Hicks | Big Man | Thug | 1 | 1 |
| Edward Grover | Morgan | Hooker | 1 | 1 |
| Edward Winter | Dr. Joel Beck | Dr. Jorgenson | 1 | 1 |
| Gary Wood | Clifford Leeman | Keough Palmer, the P.I. | 1 | 1 |
| James Murtaugh | Sumner | Simon MacLeish | 1 | 1 |
| Mark Withers | Paul Waterman | Dave Gilbert | 1 | 1 |
| Signe Hasso | Maria | Lucia Prince | 1 | 1 |
| Douglas Mossman | Chief Navarro | David Kaimi, Officer Riley | 1 | 2 |
| Gary Pagett | Deputy, Lt. Marrano | Artie | 2 | 1 |
| J.A. Preston | Mr. Pruitt | Police Lieutenant Sam McKee | 1 | 2 |
| Cyndi James Gossett | Dr. Larwin | Donna | 1 | 1 |
| Daniel Faraldo | Lorenzo | Jessie Hermano | 1 | 2 |
| Eugenia Wright | Annie | Snow White | 1 | 2 |
| Gary Frank | Dave Ripley | Jeff Spangler | 1 | 1 |
| Louise Sorel | Pat Yankee | Eleanor Greeley | 1 | 1 |
| Matthew Faison | Butler, Jack, Nolan | Lee Childress | 3 | 1 |
| Ralph Strait | Phil | Optician, Ralph | 1 | 2 |
| Stephanie Blackmore | Policewoman | Fatman's Widow | 1 | 1 |
| Stephen Elliott | Steven Baldwin | Admiral Philip Wheeler | 1 | 1 |
| William Windom | Charles Baines | Captain James T. Lyle | 1 | 1 |
| Allan Graf | Heavy #1 | Gunman at Tee Mar Office | 1 | 1 |
| John McCann | Batman | Lieutenant Drake | 1 | 1 |
| Michael Billington | Raymond Dumont | Lever | 1 | 1 |
| Peter Elbling | Akbar | Emile | 1 | 1 |
| Philip Sterling | Dr. Selman | Harry Clayborn | 1 | 1 |
| Shannon Wilcox | Ellie Duggan | Diana Franklin / Holly Berry | 1 | 1 |
| Stephen Young | Sergeant Cosgrove | Don Cassidy | 1 | 1 |
| Don Nahaku | Waiter | Valet | 1 | 1 |
| Mary Jackson | Phoney Grandma | Gandmother MacKenzie | 1 | 1 |
| Woody Eney | Mr. Austin | Philip Harriman | 1 | 1 |
Cast data from TVmaze, licensed CC BY-SA 4.0.