| Year | Title | Role | Notes |
| 1944 | Since You Went Away | Sailor Harold E. Smith | |
| 1946 | Till the End of Time | Cliff W. Harper | |
| 1947 | Honeymoon | Corporal Phil Vaughn | |
| 1948 | Texas, Brooklyn & Heaven | Eddie Tayloe | Alternative title: The Girl from Texas |
| 1949 | Massacre River | Lieutenant Larry Knight | |
| 1951 | Drums in the Deep South | Major Will Denning | |
| 1952 | Smoky Canyon | Henchman | Uncredited |
| Red Snow | Lieutenant Phil Johnson | |
| 1953 | The Charge at Feather River | Miles Archer | |
| 1954 | The Command | Captain Robert MacClaw | |
| 1955 | 5 Against the House | Al Mercer | |
| The Last Frontier | Capt. Glenn Riordan | Alternative title: Savage Wilderness |
| 1956 | On the Threshold of Space | Capt. Jim Hollenbeck | |
| Hilda Crane | Russell Burns | |
| The Beast of Hollow Mountain | Jimmy Ryan | |
| Reprisal! | Frank Madden aka Neola | Executive producer |
| 1957 | The Hard Man | Steve Burden | |
| 1958 | Bullwhip | Steve Daley | |
| 1959 | Jet Over the Atlantic | Brett Murphy | |
| 1961 | Slave of Rome | Marco Valerio | Alternative titles: La schiava di Roma, Slave Warrior |
| Sword of the Conqueror | Amalchi | Alternative title: Rosmunda e Alboino |
| 1962 | Women of Devil's Island | Henri Vallière | Alternative title: Le prigioniere dell'isola del diavolo |
| 1963 | The Executioner of Venice | Rodrigo Zeno | Alternative titles: Il boia di VeneziaBlood of the Executioner |
| 1964 | Old Shatterhand | Capt. Bradley | Alternative titles: ShatterhandApaches' Last Battle |
| Sandokan to the Rescue | Yanez | |
| Sandokan Against the Leopard of Sarawak | Yanez | Alternative title: Throne of Vengeance |
| Gunmen of the Rio Grande | Wyatt Earp / Laramie | |
| Kidnapped to Mystery Island | Souyadhana | Alternative title: I misteri della giungla nera |
| Gentlemen of the Night | Massimo Tiepolo | Alternative title: Il vendicatore mascherato |
| 1965 | The Adventurer of Tortuga | Alfonso di Montélimar | Alternative title: L'avventuriero della tortuga |
| Legacy of the Incas | Jaguar / Karl Hansen | Alternative titles: Das Vermächtnis des InkaViva Gringo |
| 1966 | Five for Revenge | Tex | Alternative title: I cinque della vendetta |
| 1967 | LSD Flesh of Devil | Rex Miller | Alternative title: LSD – Inferno per pochi dollari |
| Renegade Riders | Col. Thomas Blake | Alternative title: Sette winchester per un massacro |
| Son of Django | Father Fleming | Alternative titles: Il figlio di DjangoReturn of Django |
| Bang Bang Kid | Bear Bullock | Alternative titles: The Bang-Bang KidBang, Bang |
| 1968 | Superargo and the Faceless Giants | Prof. Wendland Wond | Alternative title: The King of Criminals |
| Long Days of Hate | Martin Benson | Alternative title: I lunghi giorni dell'odio |
| Hell in Normandy | Capt. Jack Murphy | Alternative title: Testa di sbarco per otto implacabili |
| 1969 | Battle of the Last Panzer | Lofty | Alternative title: La Battaglia dell'ultimo panzer |
| Un posto all'inferno | Major Mac Graves | Alternative title: Raiders of the Bloody Beach |
| Hell Commandos | Major Carter | Alternative title: Comando al infierno |
| The Devil's Man | Mike | Alternative title: Devilman Story |
| I diavoli della guerra | Capt. George Vincent | |
| 1971 | Reverend's Colt | Reverend Miller | Alternative title: Reverendo Colt |
| 1973 | The Silkworm | Robert | Alternative title: The Silk Worm |
| 1975 | The Pacific Connection | The Old Man | |
| 1976 | Won Ton Ton, the Dog Who Saved Hollywood | Star at screening | |
| 1978 | Where's Willie? | Tony Flore | Alternative titles: Computer KidComputer Wizard |