Greatest film of all time

The films considered the best according to national and other perspectives. Each film listed topped a notable survey—a popular poll or a poll among film reviewers—or is the highest ranked exponent of its genre or country in such a survey. Many of these sources focus on American films or were polls of English-speaking film-goers, but those considered the greatest within their respective countries are also included. Many films are considered among the best ever made.

None of the surveys that produced these citations are scientific measurements of film viewer opinions. Each may suffer from vote stacking or skewed demographics. Internet surveys have a self-selected audience of unstratified participants. The methodology of some surveys may be questionable. In some polls (as in the case of the American Film Institute) voters were asked to select films from a limited list of entries.

Every decade, the British film magazine Sight & Sound asks an international group of film professionals to vote for the greatest film of all time. This poll is regarded as one of the most important "greatest ever film" lists. American critic Roger Ebert described it as "by far the most respected of the countless polls of great movies—the only one most serious movie people take seriously."

In the Rotten Tomatoes aggregate score rankings, The Wizard of Oz (1939) is in 1st place with a 99% rating based on 109 reviews as of 10 January 2017^[update].

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