Per this post and Westeros.org’s Compendium of Theories, I’m going to try to come up with a list of theories from/r/asoiaf. No disrespect to Westeros, but this subreddit does some amazing theory development and analysis that is worth posting here. I’ll start with some major questions and theories and then do a hodgepodge of miscellaneous but highly upvoted theories. I’ll close with a tinfoil category.
Obviously, everything below will be spoilers. So, please be aware that even the theory titles I gave are spoilers.
What Will Happen to Jon Snow?
What Happened to Benjen Stark?
Who are Jon Snow’s Parents?
|/u/Jen_Snow||All||Who might know?|
|/u/J4k0b42||All||What is Jon giving up by joining the NW?|
|/u/Consequencesdaniel||All||“Promise me, Ned”|
|/u/mnjordan||All||Ned’s dilemma if R+L=J|
|/u/feldman10||All||Ashara Dayne revealed where Lyanna Stark was being held|