![]()
| Title | Year | Status | Character |
|---|
| St. Elsewhere | 1987 | TV Series | Harold O'Shea |
| Misfits of Science | 1986 | TV Series | Nate |
| Simon & Simon | 1983-1985 | TV Series | Jeweler / Guard at Plant Entrance / Bartender |
| The Fall Guy | 1982-1983 | TV Series | Bill Renault |
| The Greatest American Hero | 1982 | TV Series | McGivers |
| Black Sheep Squadron | 1978 | TV Series | Admiral Taylor |
| Lou Grant | 1978 | TV Series | Doctor |
| Peter Lundy and the Medicine Hat Stallion | 1977 | TV Movie | Muggeridge |
| The Quest | 1976 | TV Series | Storekeeper |
| Vigilante Force | 1976 | Tom Cousy (as James Lydon) |
| The New Daughters of Joshua Cabe | 1976 | TV Movie | Jim Pickett (as James Lydon) |
| The Rockford Files | 1974-1976 | TV Series | Barrow / Wyatt |
| Cannon | 1972-1976 | TV Series | Capt. Clawson / District Attorney / Carter |
| Ellery Queen | 1975 | TV Series | Radio Actor / Actor |
| Gunsmoke | 1968-1974 | TV Series | Charlie Boggs / Baines |
| The Six Million Dollar Man | 1974 | TV Series | Dr. Waters |
| Adam-12 | 1972-1974 | TV Series | Harvey Shore / Tyler |
| Police Story | 1974 | TV Series | Gambler |
| Bonnie's Kids | 1973 | as James Lydon |
| Walt Disney's Wonderful World of Color | 1972 | TV Series | John Stevens |
| Michael O'Hara the Fourth | 1972 | TV Movie | John Stevens (as James Lydon) |
| The Jimmy Stewart Show | 1972 | TV Series | Judson Hopkins |
| O'Hara, U.S. Treasury | 1972 | TV Series | Lee Foster |
| Cade's County | 1971 | TV Series | Dane Hoffman |
| The Strange Monster of Strawberry Cove | 1971 | TV Movie | Jim Durden (as James Lydon) |
| Scandalous John | 1971 | Grotch (as James Lydon) |
| Cannon | 1971 | TV Movie | Betting Clerk (as James Lydon) |
| The F.B.I. | 1968-1970 | TV Series | Church / Joey Witner |
| Death of a Gunfighter | 1969 | Luke Mills (as James Lydon) |
| Many Happy Returns | 1965 | TV Series | Mr. Ingram |
| This Is the Life | 1964 | TV Series | Patton |
| 77 Sunset Strip | 1958-1964 | TV Series | Charlie / Navigator / Johnny Jr. |
| Wagon Train | 1959-1962 | TV Series | George Blair / Clete Millikan / Hotel Clerk / ... |
| Hennesey | 1962 | TV Series | Marvin Himmelstein |
| 87th Precinct | 1961 | TV Series | Roger Pitt |
| Checkmate | 1961 | TV Series | Ben Roberts |
| Dr. Kildare | 1961 | TV Series | Reporter |
| The Life and Legend of Wyatt Earp | 1961 | TV Series | Tom Fitch |
| The Last Time I Saw Archie | 1961 | Pvt. Billy Simpson (as James Lydon) |
| Whispering Smith | 1961 | TV Series | Frank Whalen |
| Stagecoach West | 1961 | TV Series | Gil Soames |
| The Barbara Stanwyck Show | 1961 | TV Series | Harry |
| The Real McCoys | 1961 | TV Series | Frank Grant |
| Wanted: Dead or Alive | 1959-1961 | TV Series | Paul Dexter / Dan Murdock |
| General Electric Theater | 1961 | TV Series | Larry White |
| Bronco | 1958-1961 | TV Series | Shorty Dolan / Allan Brierly / Deputy Roy Proudy |
| The Untouchables | 1961 | TV Series | Hotel Clerk |
| Twilight Zone | 1961 | TV Series | Patrolman |
| Lassie | 1960 | TV Series | Mr. Dennis |
| Peter Gunn | 1960 | TV Series | Frank Rousseau |
| New Comedy Showcase | 1960 | TV Series |
| The Texan | 1960 | TV Series | Smitty |
| Hotel de Paree | 1960 | TV Series | Lowell Wheatley |
| I Passed for White | 1960 | Jay Morgan (as James Lydon) |
| The Hypnotic Eye | 1960 | Emergency Doctor |
| Tightrope | 1960 | TV Series | Paul Anderson |
| M Squad | 1959 | TV Series | Joseph Rinehart |
| Man with a Camera | 1959 | TV Series | Eddie Wilson |
| Colt .45 | 1958-1959 | TV Series | Willy / Frank Harper |
| Union Pacific | 1959 | TV Series |
| Trackdown | 1957-1959 | TV Series | Joe Corbett / Mark Turley / Sam Devlin |
| Maverick | 1959 | TV Series | Terry McKenna |
| The Gale Storm Show: Oh! Susanna | 1956-1958 | TV Series | Evans / 1st Officer Evans / Officer Evans / ... |
| Lawman | 1958 | TV Series | Nat Davis |
| Tales of the Texas Rangers | 1958 | TV Series | Lieutenant Jared Evans |
| The Silent Service | 1958 | TV Series | Lt. Johnny Hyde |
| Love That Jill | 1958 | TV Series | Richard |
| Casey Jones | 1957 | TV Series | Johnny Ferguson |
| Navy Log | 1956-1957 | TV Series | Kline / Joe Donovan |
| The Christophers | 1957 | TV Series | Peter Fielding |
| Wire Service | 1957 | TV Series | Harris |
| Lux Video Theatre | 1953-1957 | TV Series | Dinny / D. Crockett Weeks |
| Chain of Evidence | 1957 | Steve Nordstrom (as James Lydon) |
| Sergeant Preston of the Yukon | 1956 | TV Series | Johnny Lane |
| Sneak Preview | 1956 | TV Series |
| Crossroads | 1956 | TV Series | Timmy O'Brien |
| Matinee Theatre | 1956 | TV Series |
| Battle Stations | 1956 | Squawk Hewitt (as James Lydon) |
| Dr. Hudson's Secret Journal | 1956 | TV Series | Dr. Roy Weston |
| Screen Directors Playhouse | 1955 | TV Series | Lt. Fred Green |
| So This Is Hollywood | 1955 | TV Series | Andy Boone |
| Rage at Dawn | 1955 | Dedrick - Fisher's Clerk (uncredited) |
| The Lineup | 1955 | TV Series |
| Rocky Jones, Space Ranger | 1954 | TV Series | Biffen 'Biff' Cardoza / Cardoza |
| Public Defender | 1954 | TV Series | Wade Foster |
| The Desperado | 1954 | Tom Cameron (as James Lydon) |
| The Revlon Mirror Theater | 1953 | TV Series |
| Island in the Sky | 1953 | Murray (as James Lydon) |
| Racket Squad | 1953 | TV Series |
| The Ford Television Theatre | 1953 | TV Series |
| Mr. & Mrs. North | 1953 | TV Series | Harris |
| Your Jeweler's Showcase | 1953 | TV Series |
| Crown Theatre with Gloria Swanson | 1952 | TV Series |
| Corky of Gasoline Alley | 1951 | Skeezix Wallet |
| The Bigelow Theatre | 1951 | TV Series |
| Oh! Susanna | 1951 | Trumpeter Benton (as James Lydon) |
| Gasoline Alley | 1951 | Skeezix |
| The Magnificent Yankee | 1950 | Clinton, Secretary (as James Lydon) |
| The First Hundred Years | 1950 | TV Series | Chris Thayer (1950-1952) |
| Hot Rod | 1950 | David Langham (as James Lydon) |
| September Affair | 1950 | Johnny Wilson |
| Destination Big House | 1950 | Freddy Brooks (as James Lydon) |
| The Silver Theatre | 1950 | TV Series |
| Tarnished | 1950 | Junior Bunker |
| When Willie Comes Marching Home | 1950 | Charles 'Charlie' Fettles (as James Lydon) |
| The Life of Riley | 1949-1950 | TV Series | Simon Vanderhopper |
| Tucson | 1949 | Andy Bryant |
| Bad Boy | 1949 | Ted Hendry (as James Lydon) |
| Miss Mink of 1949 | 1949 | Joe Forrester |
| An Old-Fashioned Girl | 1949 | Tom Shaw |
| Joan of Arc | 1948 | Pierre d'Arc (Joan's younger brother) |
| Out of the Storm | 1948 | Donald Lewis |
| The Time of Your Life | 1948 | Dudley Raoul Bostwick (a young man in love) (as James Lydon) |
| Good News | 1947 | Tommy's Classmate (uncredited) |
| Sweet Genevieve | 1947 | Bill Kennedy |
| Cynthia | 1947 | Ricky Latham |
| Life with Father | 1947 | Clarence Jr. |
| Affairs of Geraldine | 1946 | Willy Briggs (as James Lydon) |
| Twice Blessed | 1945 | Mickey Pringle |
| Strange Illusion | 1945 | Paul Cartwright (as James Lydon) |
| Time to Kill | 1945 | Short | Lou |
| The Town Went Wild | 1944 | Bob Harrison |
| When the Lights Go on Again | 1944 | Ted Benson |
| Henry Aldrich's Little Secret | 1944 | Henry Aldrich |
| Road to Victory | 1944 | Short | Danny Ames (as Jimmie Lydon) |
| The Shining Future | 1944 | Short | Danny Ames (as Jimmie Lydon) |
| Henry Aldrich Plays Cupid | 1944 | Henry Aldrich |
| My Best Gal | 1944 | Johnny McCloud |
| Henry Aldrich, Boy Scout | 1944 | Henry Aldrich |
| Caribbean Romance | 1943 | Short | Peter Conway |
| Henry Aldrich Haunts a House | 1943 | Henry Aldrich |
| Henry Aldrich Swings It | 1943 | Henry Aldrich |
| Henry Aldrich Gets Glamour | 1943 | Henry Aldrich |
| Paramount Victory Short No. T2-4: The Aldrich Family Gets in the Scrap | 1943 | Short | Henry Aldrich |
| Aerial Gunner | 1943 | Pvt. Sanford 'Sandy' Lunt |
| A Letter from Bataan | 1942 | Short | Chuck Lewis |
| Henry Aldrich, Editor | 1942 | Henry Aldrich |
| Henry and Dizzy | 1942 | Henry Aldrich |
| The Mad Martindales | 1942 | Bobby Bruce Turner |
| Star Spangled Rhythm | 1942 | Jimmy Lydon (uncredited) |
| Cadets on Parade | 1942 | Joe Novak |
| Henry Aldrich for President | 1941 | Henry Aldrich |
| Naval Academy | 1941 | Tommy Blake |
| Bowery Boy | 1940 | Sock Dolan |
| Little Men | 1940 | Dan |
| Tom Brown's School Days | 1940 | Tom Brown |
| The Middleton Family at the New York World's Fair | 1939 | Bud |
| Two Thoroughbreds | 1939 | David Carey |
| Home Early | 1939 | Short | Junior Doakes (uncredited) |
| Back Door to Heaven | 1939 | Frankie Rogers-as aYoung Boy |