Clubs

Science Fiction Organization of La Crosse
Science Fiction Pen Pal
Science Fiction Poetry Association
Science Fiction Poets' Guild
Science Fiction Research Association
Science Fiction Society of New Hampshire
Science Fiction Society of Northern New Jersey
Science Fiction South Africa
Science Fiction Writers of America
Scientifiction Association for Boys
Scifan
Sciffy
SCIFI
Sci-Fi
Sci Fi-Club
SCIFI (Florida)
Sci-Fi Soc
Sci-Fi Zone
Scotland Magnet Science Fiction Club
SCUM
SDSFC
Seattle Worldcon Organizing Committee
Second Fandom
Second Foundation
"Second" Futurian Society of New York
Second International Beanie Brigade
Semi-Pro Writers and Artists Organization
SF3
SFA
SFAA
S F A B C
SFACS
SFAN
SFANAA
SF Appreciation Club
SF Association of Bergen County
SFCC
SFCD
SFCL
SFCoL
SFera
SFFANZ
SFFSA
SFG
SF Group
SFL
SFLIS
SFMBA
SFOHA
SFS
SFSA
SFSF
SFSFC
SFSFS
SFSNNJ
SFW
SFWA
SFWPA
Shada
Shape Science Fiction Society
Sheffield University Science Fiction and Astronomical Society
Sheffield University Union SF&F Association
Shiny Garden
Shire Society
Shortfastalkinghyperfandom
SHSFG
Silver Spring Science Fiction Society
Simon Fraser University Science Fiction Society
SI/ASFA
SIU Science Fiction Society
Six of One
Slan Slum
SLI
Smith College Science Fiction Club
Smith Science Fiction and Fantasy Society
SMOFF
SMOFofS
SMOOF
SMOOFFS
SNAFFU
Society for Creative Anachronism
Society for Elvish Studies
Society for Prevention of Bug Eyed Monsters on the Covers of Science Fiction Publications
Society for Promotion of Fannish Interests Inc
Society for the Prevention of Wire Staples in Science Fiction Magazines
Society of Illustrators
Society of Strangers
Solarians
Solaroid Club
Solaroids
SOL (Club)
Solihull SF Group
Some Sort of Medieval Elvish Society I Think
Sons of Earth
Sons of the Sand
Sorcerers, Rumrunners, and Paraihs Ltd.
Southampton University Science Fiction Society
South Australian Doctor Who Fan Club
Southeastern Ohio Science Fiction Club
South East Louisiana Fandom Association
Southeast Michigan Organization of Fans
Southern Appalachian Femfan Federation
Southern Arizona SF Association
Southern California Association for Imaginative Fiction
Southern California Institute For Fannish Interests
Southern Circle
Southern Cross Futurian Association
Southern Fandom Confederation
Southern Fandom Group
Southern Michigan Organization of Fans
Southern Mississippi SF Society
Southern Nevada Area Fantasy Fiction Union
Southern Nevada Science Fiction Foundation
Southern Pennsylvania Science Fiction Association
Southfarthing
Southfarthing Fellowship
South Florida Science Fiction Society
South Hants Science Fiction Group
South Melbourne Organisation of Fantasy Fen
South Virginia SF Association
Southwest Association of Fans
Southwest Fantasy Foundation
South West Texas State University Science Fiction and Fantasy Society
Spaced Out
Spacehounds of the IPC
Space-Time Continuum
Spectators
Speculative Fiction Association
Speculative Literature Foundation
Spellbinders
SpockSoc
Spokane Association for Imaginative Fiction
Sproutlore
SPWAO
SPWSSTFM
SRPL
SSFF
SSFFS
SSMESIT
STAC
Stamford, CT SFL
STARbase Tulsa
Stardust Society
Starforge
Star One
Starship Mawson
Star Trek Welcomittee
Star Walking
State Organizations
St. Charles Science Fiction and Fantasy Society
Stella Nova Science Fiction and Fantasy Club
Stellaris SF Club
STF League of Indiana
Stilyagi Air Corps
St. Louis Science Fiction Limited
St. Louis SF Society
St Louis Tolkien Society
Stockholm Tolkien Society
Stone Hill Science Fiction Association
Stories for Students
Stourbrudge and District SF Circle
Stourbridge Circle
Stranger Club
Strangers
Strangers (by Harry Stubbs)
Student Conventioneers of UMass
SubOrbital
Subspace-620
Surrey Circle
SUSFA
Sutherland Shire Doctor Who Fan Club
SUTS
SWAF
Swansea SF Group
Swarthmore Warders of Imaginative Literature
SWiGGLe
SWIL
SWOC
Sword and Shield
Sword and Sorcery Society
Swordsmen and Sorcerers Guild of America
SWTSU SFFS
Sydney Science Fiction Foundation
Sydney Science Fiction League
Sydney University Quidditch Society
Sydney University Science Fiction Association
Sydney University Tolkien Society
Syracuse University Science Fiction Society
Taruithorn
Tasmanian Science Fiction Association
TCSFL
Team LOL
TechSFsoc
Temponautical Society
Tennessee Fictioneers
Tennesse Fictioneers
Terminal Beach Club
Terminus Incorporated
Terran League
Terrans
Terrestrial Fantascience Guild
Tesseract
TESSFA
Texas Speculative Fiction Association
TF
TFG
The Alternative Factor
The Australian Babylon 5 Fan Club
The Blackguards
The Blue Box Companions of Birmingham
The British Teenage Fantasy and Science Fiction Society
The Burrahobbits
The Chicago Science Fiction League
The Chicago Science Fiction Society
The Circle of Janus Science Fiction and Fantasy Fan Club
The City of Small Gods
The Committee for the Political Advancement of Science Fiction
The Council of Logres
The Council of Westmarch
The "Cult Fiction" Society
The Dalek Dilemma Doctor Who Fan Club
The Dark Side
The Derelict Insurgents
The Dragon Society
The Eddoreans
The Elvish Linguistic Fellowship
The Empire State Science Fiction Association
The Fanoclasts
The Fan Squadron
The Federation of Science Fiction Fan Groups of Japan
The Fellowship of the Ring
The Forty-Ninth Ward Regular Science Fiction Organization
The Four Flushers
The Future Mad Scientists of America
The GANG
The Ganglion of Four
The Grey Havens
The Hell Pavers
The Inkings Society of Queensland
The Inklings
The Inner Ring
The Intergalactic Krewe of Chewbacchus
The International and Allied Organizations for the Purpose of Upholding and Maintaining the Use of Metallic Fasteners in Science
The International Science Fantasy Art Exhibition
The International Science Fiction Correspondence and Trading Club
The Irresistable Force
The Istari
The Khazad
The Last Alliance
The Lunarians