- Glia Web
 - Join IQ Societies such as Glia, Giga, and Grail or take one of many IQ test including test for genius, bonsai test, and isis test. - International High IQ Society
- Intelligence organisation open to those who score in the top five percent of the population. Offers free IQ tests, puzzles, and tournaments.
- Intertel
- Home of the International Society of the Intellectually Gifted, intelligence organisation founded in 1966. Browse Integra, the journal of Intertel and Intertel Hall of Fame of past members.
- Mega Society
- IQ society founded in 1982 by Dr. Ronald K. Hoeflin. Browse site for qualifications or read Noesis, online newsletter of the Mega Society.
- Mensa (30)
- Poetic Genius Society
- Organisation composed of intellectually gifted individuals with a passion for poetry.
- Prometheus Society, The
- Promotes fellowship among individuals with extremely high intelligence. Founded in 1982 by philosopher Ronald K. Hoeflin. Browse, Gift of Fire, the online journal of The Prometheus Society.
- Triple Nine Society
- Home of Triple Nine Society, an intelligence organisation where the membership requirement is to have tested at or above 99.9th percentile on at least one standardized adult intelligence test.
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