There's no shortage of great content out there. Movies, TV shows, and even live coverages and sports events have never been more accessible now that streaming has reached its peak. But perhaps little-known and overshadowed by these provisions is non-fiction media. Documentaries, in particular, are compelling and informative, great feats of storytelling, yet they're not as widely promoted as the other forms of content. Thankfully, there are many streamers that focus significantly on documentaries. Below, we list the best services to watch documentaries on your Roku.