1953: Roman Holiday – Dalton Trumbo (Note: The screen credit and award was originally credited to Ian McLellan Hunter, who was a front for Trumbo. On December 15, 1992, the Board of Governors voted to retroactively attribute the award to Trumbo. Hunter's name was removed. Although Trumbo had died some years earlier, he had been alive in 1954 and this is not considered a posthumous award)
Hondo – Louis L'Amour (Note: Originally announced on February 15, 1954, as a nominee in this category. On February 17, 1954, letters from the producer and nominee questioned its inclusion in the category, as it was based on the short story, "The Gift of Cochise", by the nominee, Mr. L'Amour, published in Collier's magazine on July 5, 1952. By waiver, the title of the short story was not included in the film's credits. The nomination was withdrawn, and only four nominees were included on the final ballot. The Academy thanked Mr. L'Amour and despite this incident, offered him a membership in the Academy.)
1956: The Brave One – Robert Rich (aka Dalton Trumbo) (Note: The name of the writer credited with authorship, Robert Rich, turned out to be an alias for Trumbo, who was being blacklisted at that time. On May 2, 1975, then-Academy president Walter Mirisch presented the Award to Trumbo.)
‡ Dates and years listed for each ceremony were the eligibility period of film release in Los Angeles County. For the first five ceremonies, the eligibility period was done on a seasonal basis, from August to July. For the 6th ceremony, held in 1934, the eligibility period lasted from August 1, 1932 to December 31, 1933. Since the 7th ceremony held in 1935, the period of eligibility became the full previous calendar year from January 1 to December 31.