Teresa Nielsen Hayden (born March 21, 1956) is an American science fiction editor, fanzine writer, essayist, and workshop instructor. She is a consulting editor for Tor Books and is well known for her weblog, Making Light. She has also worked for Federated Media Publishing, when in 2007 she was hired to revive the comment section for the blog Boing Boing. Nielsen Hayden has been nominated for Hugo Awards five times.