List of Science Fiction Novels

Odd John by Olaf Stapledon
Oh. My. Gods. by Tera Lynn Childs
Old Man's War by John Scalzi
Omega by Jack McDevitt
On the Beach by Nevil Shute
On Wings of Song by Thomas M. Disch
One in Three Hundred by J. T. McIntosh
One Million Tomorrows by Bob Shaw
One Mind's Eye by Kathy Tyers
Operation Columbus by Hugh Walters
The Ophiuchi Hotline by John Varley
Optiman by Brian Stableford
Oryx and Crake by Margaret Atwood.
Otherland series by Tad Williams
- namely, City of Golden Shadow, River of Blue Fire, Mountain of Black Glass, and Sea of Silver Light
Out of the Deeps (aka The Kraken Wakes) by John Wyndham
The Outlaws of Mars by Otis Adelbert Kline