Twentieth-Century Science-Fiction Writers is a book by Curtis C. Smith published in October 1981 on science fiction authors in the 20th century.

Anglo-American writer entries contain a biographical sketch besides including the address of the author or sometimes their literary agent.

"[1] Foundation's John Clute critiqued it with "I for one feel a sense of complex emotional and intellectual betrayal on contemplating the book.

"[2] Locus's Jeff Frane critiqued the errors as missing, miscategorized, or mistitled entries but reviewed it favorably with "In spite of its flaws, it's a useful volume, one worth gaining access to somehow.

"[3] Isaac Asimov's Science Fiction Magazine's Baird Searles commented "In all, I judge it to be a source of much information even for the non-academic general reader" but disclaimed that he contributed three articles and was listed as an adviser.