Films:
* Gone With the Wind (1939): Played the role of "Gerald O'Hara", Scarlett's love interest.
* The Adventures of Sherlock Holmes (1939): Played Inspector Lestrade.
* The Little Foxes (1941): Played the role of "Oscar Hubbard", a wealthy, ruthless businessman.
* The Strange Affair of Uncle Harry (1945): Played the role of "Uncle Harry", a man who marries his niece.
* The Big Sleep (1946): Played the role of "Arthur Geiger", a corrupt businessman.
* The Red Danube (1949): Played the role of "General Anton Bruckner", a Soviet general.
* The Best Years of Our Lives (1946): Played the role of "Homer Parrish", a returning World War II veteran.
* The Story of Seabiscuit (1949): Played the role of "Charles S. Howard", the owner of the famous racehorse Seabiscuit.
Television:
* The Millionaire (1955-1960): A popular anthology series where Ames played the role of "Michael Anthony", a wealthy philanthropist who anonymously helps people.
* Alfred Hitchcock Presents (1955-1962): Made several guest appearances in this classic anthology series.
* The Twilight Zone (1959-1964): Appears in the episode "The Lonely".
* The Untouchables (1959-1963): Appeared in the episode "The Big Fix".
* Wagon Train (1957-1965): A Western series where Ames made several guest appearances.
* The Andy Griffith Show (1960-1968): Appeared in the episode "The Man Who Came to Dinner".
* Gunsmoke (1955-1975): Another Western series where Ames made several guest appearances.
* The Virginian (1962-1971): Appeared in several episodes of this Western series.
* The FBI (1965-1974): Appeared in episodes of this crime drama series.
This is just a selection of his vast body of work. Leon Ames was a versatile actor who brought a distinct and memorable quality to each role he played.