David Geddes Hartwell (July 10, 1941 – January 20, 2016) was an American critic, publisher, and editor of thousands of science fiction and fantasy novels.

[2] Hartwell started out as a book review editor for the rock music magazine Crawdaddy!, founded by Paul Williams in 1966, and published through the 1970s.

In 1977, Hartwell edited the short-lived Cosmos Science Fiction and Fantasy magazine[6] for the newly-formed Baronet publishing.

described it as "a sophisticated mixture of sf and fantasy in an elegant format which included full-colour interior illustration".

[6] Hartwell chaired the board of directors of the World Fantasy Convention and, with Gordon Van Gelder, was the administrator of the Philip K. Dick Award.

Hartwell edited numerous anthologies, and published a number of critical essays on science fiction and fantasy.

[14][10] On January 19, 2016, Hartwell fell down a flight of stairs at his home, and was hospitalized in Plattsburgh, New York with severe head trauma.