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 | 279 reads | |
| #2 |  The Lathe of Heaven
| 4.06 | 215 reads | |
| #3 |  The Gods Themselves
| 3.91 | 105 reads | |
| #4 |  Rendezvous with Rama
| 3.93 | 393 reads | |
| #5 |  The Dispossessed
| 4.16 | 316 reads | |
| #6 |  The Forever War
| 3.96 | 391 reads | |
| #7 |  Where Late The Sweet Birds Sang
| 3.29 | 24 reads | |
| #8 |  Gateway
| 3.87 | 136 reads | |
| #9 |  Dreamsnake
| 3.43 | 21 reads | |
| #10 |  Titan
| 3.67 | 18 reads | |
| #11 |  The Snow Queen
| 3.44 | 49 reads | |
| #12 |  The Many-Colored Land
| 4.25 | 4 reads | |
| #13 |  Foundation's edge
| 3.94 | 221 reads | |
| #14 |  Startide Rising
| 3.99 | 57 reads | |
| #15 |  The Integral Trees
| 3.85 | 16 reads | |
| #16 |  The Postman
| 3.5 | 64 reads | |
| #17 |  Speaker for the Dead
| 4.11 | 517 reads | |
| #18 |  The Uplift War
| 3.89 | 47 reads | |
| #19 |  Cyteen
| 3.39 | 28 reads | |
| #20 |  Hyperion
| 4.27 | 688 reads | |
| #21 |  The Fall of Hyperion
| 4.17 | 344 reads | |
| #22 |  Barrayar
| 3.99 | 97 reads | |
| #23 |  Doomsday Book
| 3.79 | 185 reads | |
| #24 |  Green Mars
| 3.76 | 112 reads | |
| #25 |  Mirror Dance
| 4.06 | 53 reads | |
| #26 |  The Diamond Age: or, A Young Lady's Illustrated Primer
| 3.99 | 205 reads | |
| #27 |  Blue Mars
| 3.85 | 69 reads | |
| #28 |  The Rise of Endymion
| 4.1 | 150 reads | |
| #29 |  To Say Nothing of the Dog
| 4.14 | 103 reads | |
| #30 |  Cryptonomicon
| 4.27 | 302 reads | |
| #31 |  The Telling
| 3.69 | 15 reads | |
| #32 |  Passage
| 3.64 | 18 reads | |
| #33 |  The Years of Rice and Salt
| 3.52 | 43 reads | |
| #34 |  Ilium
| 3.86 | 89 reads | |
| #35 |  The Confusion
| 4.27 | 62 reads | |
| #36 |  The System of the World
| 4.34 | 65 reads | |
| #37 |  Accelerando
| 3.62 | 68 reads | |
| #38 |  Rainbows End
| 3.44 | 49 reads | |
| #39 |  The Yiddish Policemen's Union
| 3.6 | 109 reads | |
| #40 |  Anathem
| 4.21 | 229 reads | |
| #41 |  Boneshaker
| 3.33 | 117 reads | |
| #42 |  Blackout
| 3.62 | 51 reads | |
| #43 |  All Clear
| 4.03 | 40 reads | |
| #44 |  Embassytown
| 3.81 | 105 reads | |
| #45 |  Redshirts
| 3.86 | 434 reads | |
| #46 |  Abaddon's Gate
| 4.19 | 578 reads | |
| #47 |  Ancillary Sword
| 4 | 247 reads | |
| #48 |  Ancillary Mercy
| 4.15 | 187 reads | |
| #49 |  Death's End
| 4.38 | 468 reads | |
| #50 |  The Collapsing Empire
| 4.09 | 296 reads | |
| #51 |  The Calculating Stars
| 4.06 | 234 reads | |
| #52 |  The City in the Middle of the Night
| 3.21 | 70 reads | |
| #53 |  Network Effect
| 4.39 | 589 reads | |
| #54 |  A Desolation Called Peace
| 4.18 | 217 reads | |
| #55 |  The Kaiju Preservation Society
| 3.92 | 377 reads | |
| #56 |  System Collapse
| 4.16 | 328 reads |