"What if the actors from Game of Thrones were stuck playing those characters in everything else?"
This is the question that drove me to compile a list of films featuring at least two Game of Thrones actors: what if Sean Bean could only be Ned Stark? What if Charles Dance just played Tywin Lannister? What if everything occurring in their films could only relate to their existence in Westeros and Essos?
The in-universe descriptions lead the notes, while the actors are listed in italics thereafter. I could not have done this without the IMDB efforts of toh786 as a primer. Now that the series has concluded, I'll only update this list with films that premiered prior to the final episode.