Movies:
* The Ten Commandments (1956): As Pharaoh Seti I
* The Last Voyage (1960): As Captain Henry Kendrick
* The Great Escape (1963): As Colonel "The Virginian" Von Luckner
* The Dirty Dozen (1967): As General "The Butcher" Von Ravensbrück
* The Poseidon Adventure (1972): As the ship's captain
* Airport 1975 (1974): As the airline president
* The Shootist (1976): As the doctor
* The Towering Inferno (1974): As the building's architect
* The Last Days of Frank and Jesse James (1981): As Cole Younger
* The Jewel of the Nile (1985): As General Omar
* The Jewel of the Nile (1985): As General Omar
* Three Men and a Baby (1987): As the father of the baby
Television:
* The Twilight Zone (1960-1961): Multiple episodes
* The Alfred Hitchcock Hour (1962-1965): Multiple episodes
* Gunsmoke (1955-1975): Multiple episodes
* The Man from U.N.C.L.E. (1964-1968): Multiple episodes
* The Wild Wild West (1965-1969): Multiple episodes
* Mission: Impossible (1966-1973): Multiple episodes
* Hawaii Five-O (1968-1980): Multiple episodes
* The Streets of San Francisco (1972-1977): Multiple episodes
* The Rockford Files (1974-1980): Multiple episodes
* Starsky and Hutch (1975-1979): Multiple episodes
* Fantasy Island (1977-1984): Multiple episodes
* Murder, She Wrote (1984-1996): Multiple episodes
This is just a sample of Robert Douglas's extensive filmography. He was a highly respected actor who appeared in many popular and critically acclaimed films and television shows throughout his career.