The Locus Award for Best Science Fiction Novel is an annual award presented by Locus, a science fiction and fantasy magazine. The award for Sci-Fi novels was first presented in 1980. However previous to that, from 1971 they award a more generic "Best Novel" award, which coincidentally was only awarded to sci-fi books, so I have also included those books here.
| #1 |  Ringworld
| 3.67 |
| #2 |  The Lathe of Heaven
| 4.06 |
| #3 |  The Gods Themselves
| 3.84 |
| #4 |  Rendezvous with Rama
| 3.92 |
| #5 |  The Dispossessed
| 4.17 |
| #6 |  The Forever War
| 3.96 |
| #7 |  Where Late The Sweet Birds Sang
| 3.44 |
| #8 |  Gateway
| 3.87 |
| #9 |  Dreamsnake
| 3.21 |
| #10 |  Titan
| 3.64 |
| #11 |  The Snow Queen
| 3.44 |
| #12 |  The Many-Colored Land
| 3.86 |
| #13 |  Foundation's edge
| 3.96 |
| #14 |  Startide Rising
| 4.06 |
| #15 |  The Integral Trees
| 3.81 |
| #16 |  The Postman
| 3.49 |
| #17 |  Speaker for the Dead
| 4.12 |
| #18 |  The Uplift War
| 3.9 |
| #19 |  Cyteen
| 3.55 |
| #20 |  Hyperion
| 4.26 |
| #21 |  The Fall of Hyperion
| 4.14 |
| #22 |  Barrayar
| 4.07 |
| #23 |  Doomsday Book
| 3.82 |
| #24 |  Green Mars
| 3.78 |
| #25 |  Mirror Dance
| 4.09 |
| #26 |  The Diamond Age: Or, a Young Lady's Illustrated Primer
| 4.04 |
| #27 |  Blue Mars
| 3.86 |
| #28 |  The Rise of Endymion
| 4 |
| #29 |  To Say Nothing of the Dog
| 4.19 |
| #30 |  Cryptonomicon
| 4.23 |
| #31 |  The Telling
| 3.83 |
| #32 |  Passage
| 3.63 |
| #33 |  The Years of Rice and Salt
| 3.47 |
| #34 |  Ilium
| 3.81 |
| #35 |  The Confusion
| 4.15 |
| #36 |  The System of the World
| 4.2 |
| #37 |  Accelerando
| 3.51 |
| #38 |  Rainbows End
| 3.43 |
| #39 |  The Yiddish Policemen's Union
| 3.66 |
| #40 |  Anathem
| 4.13 |
| #41 |  Boneshaker
| 3.33 |
| #42 |  Blackout
| 3.63 |
| #43 |  All Clear
| 4.03 |
| #44 |  Embassytown
| 3.76 |
| #45 |  Redshirts
| 3.82 |
| #46 |  Abaddon's Gate
| 4.19 |
| #47 |  Ancillary Sword
| 3.98 |
| #48 |  Ancillary Mercy
| 4.1 |
| #49 |  Death's End
| 4.36 |
| #50 |  The Collapsing Empire
| 4.06 |
| #51 |  The Calculating Stars
| 4.07 |
| #52 |  The City in the Middle of the Night
| 3.17 |
| #53 |  Network Effect
| 4.4 |
| #54 |  A Desolation Called Peace
| 4.18 |
| #55 |  The Kaiju Preservation Society
| 3.93 |
| #56 |  System Collapse
| 4.14 |