Donald G. Keller (born 1951) is a science fiction and fantasy editor and critic. He was the co-founder of Serconia Press and was Managing Editor and a frequent contributor to "The New York Review of Science Fiction" (1990-1995), where his seminal essay on Fantasy of Manners, 'The Manner of Fantasy', appeared in 1991.
He co-edited the fantasy anthology "The Horns of Elfland" (1997) with Ellen Kushner and Delia Sherman. He is a contributor to John Clute's "The Encyclopedia of Fantasy" and is a member of the editorial board of "Slayage", the online "Encyclopedia of Buffy Studies."
Keller was active in science fiction and fantasy fandom from the 1970s-1990s as coeditor with Jeffrey D. Smith of the fanzine "Phantasmicom", editor of the journal "The Eildon Tree", and a frequent contributor to the monthly newsletter "Fantasiae".