Among all the best places to watch free movies online, below are the top sites that have free documentaries, specifically. These docs are available in categories like Religion, Society, Crime, Media, Conspiracy, Biography, and Nature. The thousands of films available can be viewed in a sortable list, or viewed by the date added, rating, votes, title, and shares. An account is unnecessary, so you can start streaming these movies right away. There’s also a single, one-page list of all the documentaries you can watch here, which makes it easy to read through the categories and titles. Some of the dozens of categories include Mystery, Science, Philosophy, Countries, Business, Drugs, Celebrity, Archaeology, 9/11, Art and Artists, Space, Music, and Spiritual. Streaming is open to anyone, but you’ll need to make a free account to post comments and tag videos as favorites. You can provide your email address to get new documentary alerts sent to you over email, or subscribe to their RSS feed. Sort videos to find the best documentaries and sign up for weekly email alerts to get notified about new content. Subscribe to the RSS feed for daily updates. The site offers a Trending Documentaries section to help viewers select content. The list of videos can be sorted by newly added, views, or rating. After selecting the documentary genre, you can filter the list by subject to see just those movies, such as Art & Artists, Biography, Crime, History, Science & Technology, Travel, Music & Performing Arts, and more. There’s even a filter for subtitles so you can ensure that the movies will have captions in the language you prefer. The site has a section for the most popular documentaries as well as newly added films. Every category list has useful sorting options like popularity and date, but also by what was most popular in the last 7 days only, and review score. The portal notes that it strives to offer only prejudice-free and unbiased films. You’ll find old and new documentaries here. There are also series’ listed under a documentary section, but they’re separate from the movies. Because no account or registration is needed, you can start enjoying free documentaries in seconds. Documentaries can also be browsed by Top 100 and by dozens of tags, including Genetics, Terrorism, Death, Poverty, World, Surgery, Sea, Gravity, and Ancient. Sort these videos by popularity or trending status, or use the random button to have a genre picked for you. There’s an RSS feed to stay up to date on additions. To stream documentaries, go to the On Demand tab and scroll down to the Documentaries section. Or, browse the live movie channels, like this one that’s dedicated to documentaries. Pluto TV also has a mobile app for iPhone, iPad, and Apple TV, so you can watch while on-the-go. All the documentaries at Spread the Word are listed on a single page as well as under categories such as Consciousness, Global Elite, Societal, War, Inspirational, Ancient History, and Corporatism. There’s also an alphabetical featured directory running along the side of the page. You can subscribe to the RSS feed for updates. The documentaries are in a one-page format you can scroll through. The eclectic offerings include Becoming Barack, 3 Magic Words, Fat, Sick & Nearly Dead, The Institute, 420 the Documentary, Turtle Power: The Definitive History of the Teenage Mutant Ninja Turtles, Arctic Tale, and Adrenaline Rush: The Science of Risk. There’s an app you can use to find documentaries on your phone, but you’ll most likely need to install other apps because most if not all the movies on Yidio are actually hosted on other sites. Since Plex is more than just a movie streaming service, it does a great job with additional details and functions. For example, on every movie page is a cast list, from which you can find other movies those people are in. You can make a user account if you want to build a watchlist.