Graphic non-fiction
Graphic nonfiction
Non-fiction comics
Non-fictional comics
Nonfictional comics

Serchay, D.S. The librarian's guide to graphic novels for children and tweens, c2008: pp. 33-34 (Nonfiction comic books have been around for more than 60 years; historical and contemporary biographies, history, science, and current events; in recent years there has been a rise in nonfiction graphic novels, often from non-comic book publishers; graphic nonfiction)
Karp, J. Graphic novels in your school library, 2012: p. 51 (list of genres includes: nonfiction)
Wikipedia, Dec. 11, 2012: Non-fiction comics (Non-fiction comics, also known as graphic non-fiction, is non-fiction in the comics medium, embracing a variety of formats from comic strips to trade paperbacks)

Comics that are intended to be educational or informational or that present facts or true accounts.