Prometheus Society

Educational, scientific, and research group for those with extreme intelligence.
http://www.PrometheusSociety.org/

SesquIQ

High IQ society. Membership active in environmentalism and research.
http://www.angelfire.com/home/sesquiq

The Cerebrals Society

A society for those whose IQ falls at or above the 99.7th percentile (top 0.3% of the general population). Members interact via discussion forums and an online journal. IQ tests are available on this site.
http://www.cerebrals.com

High IQ Society

An online community of intelligent persons.
http://www.smartgroups.com/group/group.cfm?GID=139378

International High IQ Society

Requires score of 126 on any of five free tests. Members enjoy access to chat rooms, discussion forums, online tournaments in chess, backgammon, contract bridge, and Go, as well as difficult puzzles and brainteasers, and the ability to submit works to the
http://www.highiqsociety.org/

Intertel

An organization of those with IQ scores in the 99th percentile (top 1% of the general population). The goals of the organization are to encourage meaningful intellectual fellowship, foster an exchange of ideas on any and all subjects, and to assist in re
http://www.intertel-iq.org/

The Intellect-Fellowship

A fellowship for intellectuals in the top 10% of society. The fellowship encourages creativity of members, publication of their works and thoughts, engagement in the functioning of the group and participation in one or more areas related to the fellowship
http://www.intellect-fellowship.org

Mega Society

Society with an entrance requirement at the one in a million level. Its purpose is to provide members with forums and outlets for their ideas.
http://www.megasociety.net

Ne Plus Ultra

An intellectually oriented club that seeks to gather exceptionally insightful people to discuss ideas across a variety of domains.
http://www.ne-plus-ultra.net

HighPotentialsSociety

A forum for the intellectually highly gifted. Members must have an IQ of at least 132 (M=100; SD=16).
http://www.highpotentialssociety.org/

Glia Society

Seeks to be a forum for the intelligent and to encourage intelligence-related research.
http://paulcooijmans.lunarpages.com/

Pars Society

Seeks to provide a peaceful, intellectual and private forum for its members. Proof of intelligence level at or above plus 2.5 standard deviations is required for membership.
http://pars.eu.tt/

Poetic Genius Society

An organization for highly gifted individuals (99.5 percentile IQ, or the top 0.5% of the general population) who have a love of poetry. Members can submit works for publication in the organization's online journal and interact with fellow poets via a mem
http://www.poeticgenius.com/

Genius Society

A high IQ society seeking members among scientists at the 99.5 percentile of intelligence (139 IQ/IEQ, SD=15).
http://www.geniusociety.com/

Smart People Society

Designed to develop synergy and to serve as a mutual support system as well as provide a forum for exchange of information and development of news and helpful ideas. Membership requires score of 151 on their free test.
http://www.freewebs.com/smartpeoplesociety/

Triple Nine Society

TNS is a high-IQ society which selects members at the 99.9th percentile using a number of IQ and academic aptitude tests. Journal: Vidya.
http://www.triplenine.org/

AtheistIQ

An IQ society devoted to studying atheism intelligently.
http://www.freewebs.com/atheistiq/