Calling all fantasy and sci-fi fans! This list is apparently for you! 馃槅
Turns out there are a gazillion books with the word "Shadow" in the title. Mostly fantasy and sci-fi.
To try to make the list a bit more accessible I have first included several series with shadow in the series name: The Shadow and Bone Trilogy, Ender's Shadow books, Shadow Children series, Night Angel series (all 4 books have shadow in the title) and the Shadow Falls series.
Note: I did NOT put the entirety of Cassandra Clare's Shadowhunter Series because there is already a (giant) list of those on this site. However, there are a couple books from that series with shadow in the title sprinkled through the rest of the list.
