A ranking of the top documentaries of all time by leveraging data on all documentary movies to create a "Stacker score" that serves as a weighted index split evenly between IMDb and Metacritic scores. To qualify, the film had to be listed as a documentary on IMDb, have a Metascore, and have at least 1,000 IMDb user votes. Ties were broken by Metascore and further ties were broken by votes. Documentary TV series were not included.