The 1989 Annual World's Best SF is an anthology of science fiction short stories edited by Donald A. Wollheim and Arthur W. Saha, the eighteenth volume in a series of nineteen.

It was first published in paperback by DAW Books in June 1989, followed by a hardcover edition issued in September of the same year by the same publisher as a selection of the Science Fiction Book Club.

The book collects eleven novellas, novelettes and short stories by various science fiction authors, with an introduction by Isaac Asimov taking the place of the usual such effort by Wollheim.

The stories were previously published in 1988 in the magazines Interzone, Analog Science Fiction and Fact, Isaac Asimov's Science Fiction Magazine, Omni, Amazing Stories, and Rod Serling's The Twilight Zone Magazine, the collection Dance Band on the Titanic, and the anthology Other Edens II.

"The Flies of Memory" placed eighteenth in the 1989 Locus Poll Award for Best Novella.