Here is a list of the best octology movies to watch on Amazon, Google Play or iTunes. My favorite one is "Harry Potter" saga.
Also here are the best movies of all time and genres.If you like movies of specific genre, here are my list of the best action, adventure, animation, biography, comedy, crime, documentary, drama, family, fantasy, history, horror, musical, mystery, romance, sci-fi, sport, thriller, war or western movies.
If you have more time, feel free to check out my other lists of the best dilogy, trilogy, quadrilogy, pentalogy, hexalogy or septology movies.
Or feel free to check out my other movie lists of the best movie directors, actors or actresses.

Harry Potter and the Philosopher's Stone
2001 | Chris Columbus
adventure family fantasy
Watch on Amazon, Google Play or iTunes. Also available to buy separately on Amazon or in a bundle on Amazon, Google Play or iTunes.

Harry Potter and the Chamber of Secrets
2002 | Chris Columbus
adventure family fantasy
Watch on Amazon, Google Play or iTunes. Also available to buy separately on Amazon or in a bundle on Amazon, Google Play or iTunes.

Harry Potter and the Prisoner of Azkaban
2004 | Alfonso CuarĂ³n
adventure family fantasy
Watch on Amazon, Google Play or iTunes. Also available to buy separately on Amazon or in a bundle on Amazon, Google Play or iTunes.

Harry Potter and the Goblet of Fire
2005 | Mike Newell
adventure family fantasy
Watch on Amazon, Google Play or iTunes. Also available to buy separately on Amazon or in a bundle on Amazon, Google Play or iTunes.

Harry Potter and the Order of the Phoenix
2007 | David Yates
adventure family fantasy
Watch on Amazon, Google Play or iTunes. Also available to buy separately on Amazon or in a bundle on Amazon, Google Play or iTunes.

Harry Potter and the Half-Blood Prince
2009 | David Yates
adventure family fantasy
Watch on Amazon, Google Play or iTunes. Also available to buy separately on Amazon or in a bundle on Amazon, Google Play or iTunes.

Harry Potter and the Deathly Hallows: Part 1
2010 | David Yates
adventure family fantasy
Watch on Amazon, Google Play or iTunes. Also available to buy separately on Amazon or in a bundle on Amazon, Google Play or iTunes.

Harry Potter and the Deathly Hallows: Part 2
2011 | David Yates
adventure family fantasy
Watch on Amazon, Google Play or iTunes. Also available to buy separately on Amazon or in a bundle on Amazon, Google Play or iTunes.