| Movie | 1963 | The Pink Panther | George Lytton | |
| Movie | 1998 | Wild Things | Tom Baxter | |
| Movie | 1997 | Austin Powers: International Man of Mystery | Number Two | |
| Movie | 1999 | Austin Powers: The Spy Who Shagged Me | Number Two | |
| Movie | 2002 | Austin Powers in Goldmember | Number Two | |
| Movie | 1992 | The Player | Robert Wagner | |
| Movie | 1993 | Dragon: The Bruce Lee Story | Bill Krieger | |
| Movie | 1999 | Play It to the Bone | Hank Goody | |
| Movie | 1974 | The Towering Inferno | Bigelow | |
| Movie | 2007 | Netherbeast Incorporated | President James A. Garfield | |
| Movie | 1976 | Midway | Lt.Cmdr. Blake | |
| Movie | 1951 | Let's Make It Legal | Jerry Denham | |
| Movie | 2003 | Sol Goode | Sol's Dad | |
| Movie | 1953 | Beneath the 12-Mile Reef | Tony Petrakis | |
| Movie | 1999 | Crazy in Alabama | Harry Hall | |
| Movie | 1966 | Harper | Allan Taggert | |
| Movie | 1962 | The Longest Day | U.S. Army Ranger | |
| Movie | 2007 | A Dennis the Menace Christmas | George Wilson | |
| Movie | 2009 | Glanz und Elend in Hollywood: Natalie Wood | Self | |
| Movie | 2005 | The Fallen Ones | Morton | |
| Movie | 1983 | Curse of the Pink Panther | George Lytton | |
| Movie | 1979 | The Concorde... Airport '79 | Kevin Harrison | |
| Movie | 1954 | Broken Lance | Joe Devereaux | |
| Movie | 1969 | Winning | Lou Erding | |
| Movie | 2005 | Category 7: The End of the World | Sen. Ryan Carr | |
| Movie | 2007 | Man in the Chair | Taylor Moss | |
| Movie | 1952 | Stars and Stripes Forever | Willie Little | |
| Movie | 1999 | Eloise And Her Rawther Enormous Life | Self | |
| Movie | 1951 | The Frogmen | Lt. (jg) Franklin | |
| Movie | 1958 | The Hunters | Lt. Ed Pell | |
| Movie | 1953 | Titanic | Gifford "Giff" Rogers | |
| Movie | 1951 | Halls of Montezuma | Coffman | |
| Movie | 1954 | Prince Valiant | Prince Valiant | |
| Movie | 1961 | Sail A Crooked Ship | Gilbert Barrows | |
| Movie | 1952 | With a Song in My Heart | GI paratrooper | |
| Movie | 1971 | City Beneath the Sea | Brett | |
| Movie | 2006 | Hoot | Mayor Grandy | |
| Movie | 1997 | Austin Powers' Electric Psychedelic Pussycat Swingers Club | The Swingers Club | |
| Movie | 1957 | The True Story of Jesse James | Jesse James | |
| Movie | 1956 | A Kiss Before Dying | Bud Corliss | |
| Movie | 1952 | What Price Glory | Private Lewisohn | |
| Movie | 2002 | Nancy & Frank - A Manhattan Love Story | Curtis Sherman | |
| Movie | 2001 | The Retrievers | Durham Haysworth | |
| Movie | 1999 | Fatal Error | | |
| Movie | 1962 | The War Lover | 1st Lt. Ed Bolland | |
| Movie | 1972 | Madame Sin | Anthony Lawrence | |
| Movie | 1967 | Banning | Mike Banning | |
| Movie | 1956 | Between Heaven and Hell | Sfc. Pvt. Sam Francis Gifford | |
| Movie | 1956 | The Mountain | Christopher 'Chris' Teller | |
| Movie | 2003 | The Calling | Amos Jenkins | |
| Movie | 1968 | The Biggest Bundle of Them All | Harry Price | |
| Movie | 1983 | I Am The Cheese | Dr. Brint | |
| Movie | 1955 | White Feather | Josh Tanner | |
| Movie | 1959 | Say One for Me | Tony Vincent | |
| Movie | 2014 | The Hungover Games | Liam | |
| Movie | 1995 | Darryl F. Zanuck: 20th Century Filmmaker | Self | |
| Movie | 2001 | Cleopatra: The Film That Changed Hollywood | Self | |
| Movie | 2000 | Cubby Broccoli: The Man Behind Bond | Himself | |
| Movie | 1960 | All the Fine Young Cannibals | Chad Bixby | |
| Movie | 2010 | Life's a Beach | Tom Wald | |
| Movie | 2022 | Romantic Mysticism: The Music of Billy Goldenberg | Self | |
| Movie | 1957 | Stopover Tokyo | Mark Fannon | |
| Movie | 1976 | Death at Love House | Joel Gregory (Jr. & Sr.) | |
| Movie | 2000 | The Hustle | Felix Baumgartner | |
| Movie | 1962 | The Condemned of Altona | Werner von Gerlach | |
| Movie | 2003 | Mystery Woman | Jack Stenning | |
| Movie | 1998 | Mythos Hollywood - Das Geheimnis des Erfolgs | Self | |
| Movie | 2000 | Richard Widmark: Strength of Characters | Self | |
| Movie | 1997 | Overdrive | Freddie | |
| Movie | 1993 | Deep Trouble | Charles Madigan | |
| Movie | 1972 | The Streets of San Francisco | David J. Farr | |
| Movie | 1984 | To Catch a King | Joe Jackson | |
| Movie | 1995 | Hart to Hart: Two Harts in 3/4 Time | Jonathan Hart | |
| Movie | 1994 | Hart to Hart: Crimes of the Hart | Jonathan Hart | |
| Movie | 1994 | Hart to Hart: Home Is Where the Hart Is | Jonathan Hart | |
| Movie | 1968 | Don't Just Stand There | Lawrence Colby | |
| Movie | 1999 | Canned Ham: The Dr. Evil Story | Number Two | |
| Movie | 1996 | Hart to Hart: Till Death Do Us Hart | Jonathan Hart | |
| Movie | 1973 | The Affair | Marcus Simon | |
| Movie | 1994 | Hart to Hart: Old Friends Never Die | Jonathan Hart | |
| Movie | 1995 | Hart to Hart: Secrets of the Hart | Jonathan Hart | |
| Movie | 1967 | How I Spent My Summer Vacation | Jack Washington | |
| Movie | 1971 | Crosscurrent | Howard McBride | |
| Movie | 1976 | Cat on a Hot Tin Roof | Brick | |
| Movie | 1991 | False Arrest | Ron Lukezic | |
| Movie | 1958 | In Love and War | Frank "Frankie" O'Neill | |
| Movie | 2015 | Winning: The Racing Life of Paul Newman | Self | |
| Movie | 1972 | Killer by Night | Dr. Larry Ross | |
| Movie | 2000 | Becoming Dick | Edward | |
| Movie | 2014 | Northpole | Santa Claus | |
| Movie | 1994 | Parallel Lives | Sheriff | |
| Movie | 1991 | This Gun for Hire | "Raven" | |
| Movie | 1991 | Delirious | Jack Gates (uncredited) | |
| Movie | 1953 | The Silver Whip | Jess Harker | |
| Movie | 1975 | Switch | Pete T. Ryan | |
| Movie | 2006 | Everyone's Hero | Mr. Robinson (voice) | |
| Movie | 1989 | William Holden: The Golden Boy | Self | |
| Movie | 1997 | Barbara Stanwyck: Straight Down The Line | Self | |
| Movie | 1986 | There Must Be a Pony | Ben Nichols | |
| Movie | 1985 | Night of 100 Stars II | Self | |
| Movie | 1996 | Hart to Hart: Harts in High Season | Jonathan Hart | |
| Movie | 1993 | Hart to Hart Returns | Jonathan Hart | |
| Movie | 1988 | Indiscreet | Philip Adams | |
| Movie | 1950 | The Happy Years | Student | |
| Movie | 2015 | Tab Hunter Confidential | Self | |
| Movie | 2003 | Hollywood Homicide | Himself | |
| Movie | 1987 | Love Among Thieves | Mike Chambers | |
| Movie | 2017 | What Happened to Monday | Charles Benning | |
| Movie | 2024 | Blake Edwards: A Love Story in 24 Frames | Self | |
| Movie | 2000 | Rocket's Red Glare | Gus Baker | |
| Movie | 1998 | Off the Menu: The Last Days of Chasen's | Self | |
| Movie | 2015 | Robert Osborne's 20th Anniversary Tribute | Self | |
| Movie | 1951 | Teresa | G.I. (uncredited) | |
| Movie | 1998 | Something to Believe In | Brad | |
| Movie | 2018 | Strings | Peter Klein | |
| Movie | 1986 | The Spencer Tracy Legacy: A Tribute by Katharine Hepburn | Self | |
| Movie | 1971 | Perlico - Perlaco | | |
| Movie | 1999 | Forever Fabulous | Lyle Devereaux Green | |
| Movie | 1958 | Mardi Gras | Himself (uncredited) | |
| Movie | 2016 | Hollywont | | |
| Movie | 2016 | Thirty Nine | Father | |
| Movie | 2020 | Natalie Wood: What Remains Behind | Self | |
| Movie | 1975 | The Abduction of Saint Anne | Dave Hatcher | |
| Movie | 1999 | No Vacancy | Mr. Tangerine | |
| Movie | 2020 | Jay Sebring… Cutting to the Truth | Self | |
| Movie | 2001 | Lana Turner... a Daughter's Memoir | Narrator (voice) | |
| Movie | 2004 | El padrino: The Latin Godfather | Paul Fisch | |
| Movie | 1997 | Twentieth Century Fox: The First 50 Years | Self | |
| Movie | 1996 | Intimate Portrait: Bette Davis | | |
| Movie | 1994 | Biography: Bette Davis — If Looks Could Kill | Self | |
| Movie | 1979 | Hart to Hart | Jonathan Hart | |
| Movie | 2014 | Private Screenings: Robert Osborne | Self | |
| Movie | 2018 | The Ghost of Peter Sellers | Himself | |
| Movie | 1989 | Hollywood on Horses | Self | |
| Movie | 1996 | Clark Gable: Tall, Dark, and Handsome | Self | |
| Movie | 2009 | The Wild Stallion | Novak | |
| Movie | 1999 | Dill Scallion | Mr. Llama | |
| Movie | 1987 | Happy 100th Birthday, Hollywood | Self | |
| Movie | 2018 | Natalie Wood: An American Murder Mystery | | |
| Movie | N/A | SEGAL | Self | |
| TV Show | 1989 | The Simpsons | Robert Wagner (voice) | 1 |
| TV Show | 1972 | Colditz | Major Phil Carrington | 1 |
| TV Show | 1989 | Seinfeld | Dr. Abbott | 1 |
| TV Show | 2003 | Hope & Faith | Jack Fairfield | 7 |
| TV Show | 2003 | Las Vegas | Alex Avery | 1 |
| TV Show | 1997 | The View | Self | 6 |
| TV Show | 2003 | Two and a Half Men | Teddy | 5 |
| TV Show | 2004 | Hustle | Anthony Westley | 1 |
| TV Show | 1992 | The Tonight Show with Jay Leno | | 1 |
| TV Show | 1977 | The Hardy Boys / Nancy Drew Mysteries | | 1 |
| TV Show | 1979 | Hart to Hart | Jonathan Hart | 110 |
| TV Show | 1996 | E! True Hollywood Story | | 1 |
| TV Show | 2008 | Do Not Disturb | | 1 |
| TV Show | 1951 | Hallmark Hall of Fame | | 1 |
| TV Show | N/A | Pretty/Handsome | Scotch | 1 |
| TV Show | 2004 | Boston Legal | Barry Goal | 2 |
| TV Show | 1975 | Switch | Pete Ryan | 70 |
| TV Show | 1968 | Rowan & Martin's Laugh-In | Self | 2 |
| TV Show | 1952 | This Is Your Life | Self | 1 |
| TV Show | 1985 | Lime Street | James Greyson Culver | 8 |
| TV Show | 1991 | P.S. I Luv U | | 1 |
| TV Show | 1955 | The 20th Century Fox Hour | Wade Connors | 1 |
| TV Show | 1956 | The Dinah Shore Chevy Show | Self | 1 |
| TV Show | 1973 | The American Film Institute Salute to ... | Self | 2 |
| TV Show | 2002 | V Graham Norton | Self | 1 |
| TV Show | 1989 | Around the World in 80 Days | Alfred Bennett | 3 |
| TV Show | 1953 | The Oscars | Self | 1 |
| TV Show | 2001 | Good Day Live | Self | 1 |
| TV Show | 1975 | Saturday Night Live | Self - Host | 1 |
| TV Show | 1985 | North and South | Cooper Main | 3 |
| TV Show | 2003 | NCIS | Anthony DiNozzo Sr. | 13 |
| TV Show | 1955 | The 20th Century Fox Hour | Gil Carter | 1 |
| TV Show | 1968 | It Takes a Thief | Alexander Mundy | 66 |
| TV Show | 1976 | Laurence Olivier Presents | Brick | 1 |
| TV Show | 2007 | The Graham Norton Show | Self | 1 |
| TV Show | 1950 | The Bob Hope Show | Self | 2 |
| TV Show | 2017 | Date My Dad | Armand | 2 |
| TV Show | 1948 | The Ed Sullivan Show | Self | 3 |
| TV Show | 1950 | The Jack Benny Program | Robert Wagner | 1 |
| TV Show | 1978 | Pearl | Capt. Cal Lankford | 3 |
| TV Show | 1950 | What's My Line? | Self - Mystery Guest | 1 |
| TV Show | 1992 | Jewels | Charles Davenport | 2 |
| TV Show | 1988 | Windmills of the Gods | Mike Slade | 2 |
| TV Show | 1971 | V.I.P. Schaukel | Self | 1 |
| TV Show | 2010 | Hot in Cleveland | Jim | 1 |
| TV Show | 1988 | LIVE with Kelly and Mark | | 1 |
| TV Show | 1993 | Intimate Portrait | Self | 1 |
| TV Show | 2009 | The League | Gumpa Duke | 1 |
| TV Show | 1998 | Hollywood Squares | | 5 |
| TV Show | 2005 | Category 7: The End of the World | Senator Ryan Carr | 2 |
| TV Show | 1968 | The Dick Cavett Show | Self - Guest | 1 |
| TV Show | 1999 | Futurama | Robert Wagner's Head (voice) | 1 |
| TV Show | 1963 | Bob Hope Presents the Chrysler Theatre | Harry Brophy | 1 |
| TV Show | 1968 | The Name of the Game | David Corey | 1 |
| TV Show | 1944 | Golden Globe Awards | Self - Presenter | 4 |
| TV Show | 1978 | The Critical List | Dr. Nick Sloan | 2 |
| TV Show | 1944 | Golden Globe Awards | Self - Nominee | 1 |
| TV Show | 1944 | Golden Globe Awards | Self - Nominee / Presenter | 2 |
| TV Show | 1974 | Dinah! | Self | 2 |
| TV Show | 1968 | The Name of the Game | Nick Freitas | 1 |
| TV Show | 1990 | The Trials of Rosie O'Neill | Peter Donovan | 1 |
