Academy Award for Best Documentary Feature Film

The Academy Award for Best Documentary Feature Film is an award for documentary films. In 1941, the first awards for feature-length documentaries were bestowed as Special Awards to Kukan and Target for Tonight. They have since been bestowed competitively each year, with the exception of 1946. Copies of every winning film (along with copies of most nominees) are held by the Academy Film Archive.

Following the Academy's practice, films are listed below by the award year (that is, the year they were released under the Academy's rules for eligibility). In practice, due to the limited nature of documentary distribution, a film may be released in different years in different venues, sometimes years after production is complete.

Finalists for Best Documentary Feature are selected by the Documentary Branch based on a preliminary ballot. A second preferential ballot determines the five nominees. Prior to the 78th Academy Awards, there were twelve films shortlisted.

For this Academy Award category, the following superlatives emerge:

Arthur Cohn – 3 awards (resulting from 4 nominations); Simon Chinn – 2 awards; Jacques-Yves Cousteau – 2 awards; Walt Disney – 2 awards (resulting from 7 nominations; Disney has an additional 2 wins in the Documentary Short Subject category); Rob Epstein – 2 awards; Marvin Hier – 2 awards; Barbara Kopple – 2 awards Mark Jonathan Harris – 2 awards

Michael Moore's Fahrenheit 9/11, at the time the highest-grossing documentary film in movie history, was ruled ineligible because Moore had opted to have it played on television prior to the 2004 election. Previously, the 1982 winner Just Another Missing Kid had already been broadcast in Canada and won that country's ACTRA award for excellence in television at the time of its nomination.

In 1990, a group of 45 filmmakers filed a protest to the Academy of Motion Picture Arts and Sciences over a potential conflict of interest involving Mitchell Block. They noted that Block was a member of the Documentary Steering Committee, which selects films as nominees, but he had a conflict of interest because his company Direct Cinema owned the distribution rights to three of the five films (including eventual winner Common Threads: Stories from the Quilt) selected that year as nominees for an Academy Award for Best Documentary Feature. They noted that Michael Moore's Roger & Me (distributed by Warner Brothers) was omitted from the nominees, although it had been highly praised by numerous critics and was ranked by many critics as one of the top ten films of the year.

The controversy over Hoop Dreams' exclusion was enough to have the Academy Awards begin the process to change its documentary voting system. Roger Ebert, who had declared it to be the best 1994 movie of any kind, looked into its failure to receive a nomination: "We learned, through very reliable sources, that the members of the committee had a system. They carried little flashlights. When one gave up on a film, he waved a light on the screen. When a majority of flashlights had voted, the film was switched off. Hoop Dreams was stopped after 15 minutes."