The Year's Best Science Fiction: Twentieth Annual Collection

Dust cover of first edition
Editor	Gardner Dozois
Cover artist	Dominic Harman
Language	English
Series	The Year's Best Science Fiction
Genre	Science fiction
Publisher	St. Martin's Press
Publication date	2003
Publication place	United States
Media type	Print (hardcover & trade paperback)
Pages	xxxix & 648 pp
ISBN	9780312308599
Preceded by	The Year's Best Science Fiction: Nineteenth Annual Collection
Followed by	The Year's Best Science Fiction: Twenty-First Annual Collection

The Year's Best Science Fiction: Twentieth Annual Collection is an anthology of science fiction short stories edited by Gardner Dozois, the twentieth volume in an ongoing series. It was first published in hardcover and trade paperback by St. Martin's Press in July 2003, with a book club edition co-issued with the Science Fiction Book Club, and an ebook edition following in August of the same year. The first British edition was published in trade paperback by Robinson in December 2003, under the alternate title The Mammoth Book of Best New Science Fiction: 16th Annual Collection.^[1]

The book collects twenty-five novellas, novelettes and short stories by various science fiction authors, with an introductory summation of the year, notes and concluding bibliography by the editor. The stories were previously published in 2002 in various science fiction and other magazines.^[1]

• "Summation: 2002" (Gardner Dozois)
• "Breathmoss" (Ian R. MacLeod)
• "The Most Famous Little Girl in the World" (Nancy Kress)
• "The Passenger" (Paul McAuley)
• "The Political Officer" (Charles Coleman Finlay)
• "Lambing Season" (Molly Gloss)
• "Coelacanths" (Robert Reed)
• "Presence" (Maureen F. McHugh)
• "Halo" (Charles Stross)
• "In Paradise" (Bruce Sterling)
• "The Old Cosmonaut and the Construction Worker Dream of Mars" (Ian McDonald)
• "Stories for Men" (John Kessel)
• "To Become a Warrior" (Chris Beckett)
• "The Clear Blue Seas of Luna" (Gregory Benford)
• "V.A.O." (Geoff Ryman)
• "Winters Are Hard" (Steven Popkes)
• "At the Money" (Richard Wadholm)
• "Agent Provocateur" (Alexander Irvine)
• "Singleton" (Greg Egan)
• "Slow Life" (Michael Swanwick)
• "A Flock of Birds" (James Van Pelt)
• "The Potter of Bones" (Eleanor Arnason)
• "The Whisper of Disks" (John Meaney)
• "The Hotel at Harlan's Landing" (Kage Baker)
• "The Millennium Party" (Walter Jon Williams)
• "Turquoise Days" (Alastair Reynolds)
• "Honorable Mentions: 2002" (Gardner Dozois)

The anthology placed first in the 2004 Locus Poll Award for Best Anthology.^[1]