Leo Gordon
- Maverick
1994 Poker Player
- The Adventures of Young Indiana Jones: Hollywood Follies
1994 Wyatt Earp
- seaQuest DSV
1993 Smith
- Mob Boss
1990 Don O'Reily
- Alienator
1990 Cpl. Coburn
- Big Top Pee-wee
1988 Joe the Blacksmith (as Leo V. Gordon)
- Saturday the 14th Strikes Back
1988 The Evil One
- The Garbage Pail Kids Movie
1987 Guard #1
- Wiseguy
1987
- Savage Dawn
1985 Sheriff
- Moonlighting
1985 Warden Cosgrove ( As Leo V. Gordon)
- M.A.D.D.: Mothers Against Drunk Drivers
1983 Officer Horvath
- Fire and Ice
1983 Jarol
- The Winds of War
1983 'Train' Anderson
- Fame
1982
- St. Elsewhere
1982 Bjorn Johnston
- Rage!
1980 Cal's Father
- Magnum, P.I.
1980 Croquet Player
- Enos
1980
- Bog
1979 Dr. John Warren
- Son of Hitler
1979 Fritz Tünnes
- The Lucifer Complex
1978 C.I.A. Chief Al Norris (uncredited)
- Nashville Girl
1976 Burt
- The Shootist
1976 Books' Victim in Flashback (archive footage / uncredited)
- The Pot
1975 Writer
- Little House on the Prairie
1974 Milo Stavroupolis
- The Rockford Files
1974 Charles Martell
- My Name Is Nobody
1973 Red
- Bonnie's Kids
1973 Charley
- The Streets of San Francisco
1972 Eddie Suslow
- The Trackers
1971 Higgins
- Alias Smith and Jones
1971 Ebenezer
- Cannon
1971
- You Can't Win 'Em All
1970 Writer
- McCloud
1970
- Marcus Welby, M.D.
1969 Sgt. Lewis
- All the Loving Couples
1969 Author
- The Outcasts
1968
- Adam-12
1968 Writer
- The Mod Squad
1968 Unit Leader
- Tobruk
1967 Screenplay
- The St. Valentine's Day Massacre
1967 Heitler
- Devil's Angels
1967 Sheriff Henderson
- Pistols 'n' Petticoats
1967 Cyrus Breech
- Hostile Guns
1967 Hank Pleasant
- The High Chaparral
1967 Lije Driskill
- Rango
1967
- Mr. Terrific
1967 Archie Thompson
- Beau Geste
1966 Krauss
- The Night of the Grizzly
1966 Cass Dowdy
- Tarzan
1966
- The Dictator's Guns
1965 Morrison
- The Girls on the Beach
1965 Second Waiter
- The F.B.I.
1965 Drunk Driver
- Laredo
1965
- Get Smart
1965 Grillak
- The Bounty Killer
1965 Writer
- Kitten with a Whip
1964 Enders
- Daniel Boone
1964 Silas Morgan
- 12 O'Clock High
1964 MSgt. Caber McVaigh
- The Raven
1963 Grimes (voice) (uncredited)
- The Haunted Palace
1963 Edgar Weeden / Ezra Weeden
- McLintock!
1963 Jones
- Kings of the Sun
1963 Hunac Ceel
- The Great Adventure
1963 McCanles
- Bob Hope Presents the Chrysler Theatre
1963 Biggie
- Arrest and Trial
1963 Fred Kordiak
- Temple Houston
1963 Charles Grimm
- The Terror
1963 Screenplay
- The Intruder
1962 Sam Griffin
- Tarzan Goes to India
1962 Bryce
- The Nun and the Sergeant
1962 Dockman
- The Virginian
1962 Jack Scratch
- Tower of London
1962 Story
- The Cat Burglar
1961 Writer
- Noose for a Gunman
1960 Link Roy
- The Andy Griffith Show
1960 Luke Comstock
- Route 66
1960 Bernie Duncan
- Outlaws
1960
- The Roaring 20's
1960
- Coronado 9
1960 Kyte
- Valley of the Redwoods
1960 Writer
- The Case of the Dangerous Robin
1960 Creator
- The Jayhawkers!
1959 Jake Barton
- Escort West
1959 Writer
- The Big Operator
1959 Danny Sacanzi
- Mr. Lucky
1959 Killer
- Rawhide
1959 Chris Jenson
- The Alaskans
1959
- Lock-Up
1959
- Law of the Plainsman
1959 Rand
- Tightrope
1959 Charlie Carson
- Bonanza
1959 Writer
- The Untouchables
1959 Pops Gantry
- The Deputy
1959 Evan Sloate
- The Wasp Woman
1959 Screenplay
- Attack of the Giant Leeches
1959 Original Story
- Hawaiian Eye
1959 Writer
- The Notorious Mr. Monks
1958 Chip Klamp
- Apache Territory
1958 Zimmerman
- Quantrill's Raiders
1958 William Clarke Quantrill
- Ride a Crooked Trail
1958 Sam Mason
- Cry Baby Killer
1958 Writer
- Sea Hunt
1958 Panicky Miner
- Bronco
1958
- Lawman
1958 Story
- Bat Masterson
1958 Writer
- Yancy Derringer
1958 Lance Carter
- The Rifleman
1958 Stack Wade
- Hot Car Girl
1958 Screenplay
- Baby Face Nelson
1957 John Dillinger
- Lure of the Swamp
1957 Steggins, Insurance Investigator
- The Tall Stranger
1957 Stark
- Man in the Shadow
1957 Chet Huneker
- Black Patch
1957 Writer
- The Restless Breed
1957 Cherokee
- Maverick
1957 Writer
- Perry Mason
1957 Charles Duncan
- Have Gun, Will Travel
1957 Clyde McNally
- 26 Men
1957
- Tombstone Territory
1957 Writer
- Casey Jones
1957 Deputy Marshal Martin Croy
- Sugarfoot
1957 Writer
- The Steel Jungle
1956 Lupo
- Great Day in the Morning
1956 Zeff Masterson
- Red Sundown
1956 Rod Zellman
- The Man Who Knew Too Much
1956 Drayton's Chauffeur (uncredited)
- The Conqueror
1956 Tartar Captain
- 7th Cavalry
1956 Vogel
- Johnny Concho
1956 Mason
- Circus Boy
1956
- State Trooper
1956 Writer
- Broken Arrow
1956 Will Carr
- Dick Powell's Zane Grey Theatre
1956 Jed Scott
- On Trial
1956
- Man with the Gun
1955 Ed Pinchot
- Robbers' Roost
1955 Jeff
- Soldier of Fortune
1955 Big Matt
- Seven Angry Men
1955 Martin White
- Tennessee's Partner
1955 The Sheriff
- Santa Fe Passage
1955 Tuss McLawery
- Ten Wanted Men
1955 Frank Scavo
- Cheyenne
1955 Story
- Gunsmoke
1955 Hack Prine
- Navy Log
1955
- The Life and Legend of Wyatt Earp
1955 Miggles Hannegan
- Frontier
1955
- Screen Director's Playhouse
1955 Tom Martin
- Crossroads
1955 Sergeant Leroy
- Riot in Cell Block 11
1954 Crazy Mike Carne
- The Yellow Mountain
1954 Drake
- Sign of the Pagan
1954 Bleda
- The Bamboo Prison
1954 Pike
- The Wonderful World of Disney
1954 Bill
- The Adventures of Rin Tin Tin
1954 Garth
- Lassie
1954 Bob Stokes
- Studio 57
1954
- Hondo
1953 Ed Lowe
- Gun Fury
1953 Tom 'Jess' Burgess
- All the Brothers Were Valiant
1953 Peter How
- China Venture
1953 Sgt. Hank Janowicz
- The Ford Television Theatre
1952 Leonard
- Lux Video Theatre
1950 Augie
- The Wasp Woman
Original Film Writer
