- CIVIQ society
- International High IQ society for all gifted individuals with an exceptional intelligence above the level of the third standard deviation, IQ 145, sd 15 respectively IQ 148, sd 16
- Genius Society
- The Genius Society is a high IQ society, founded in January 2004, with the purpose of bringing together qualified members at the 99.9th percentile in intelligence.
- GIGA society
- International High IQ society for all gifted individuals with an exceptional intelligence above the level of the sixth standard deviation, IQ 190, sd 15 respectively IQ 196, sd 16
- High IQ Society
- The main goals of the society are to foster intellectual thinking and to provide social opportunities for members.
- Mensa USA site
- Mensa is an international society that has one - and only one - qualification for membership: a score in the top 2% of the population on a standardized intelligence test.
- High IQ society for musicians
- ePiq IQ society
- An IQ society which has as a main purpose to bring together intelligent people all around the globe.
- HELLIQ society
- International High IQ society for all gifted individuals with an exceptional intelligence above the level of the fourth standard deviation, IQ 160, sd 15 respectively IQ 164, sd 16
- Intelligent people have special intellectual, emotional, and social needs which remain with them throughout life. Intertel helps meet those needs for individuals with intelligence quotients at or above the 99th percentile as measured by standard IQ tests.
- Ludomind Society
- The goal of the society is - without any exception - to present BEAUTIFUL puzzles.
- Mega Society
- A high-IQ society with a one-in-a-million cutoff.
- OLYMPIQ society
- International High IQ society for all gifted individuals with an exceptional intelligence above the level of the fifth standard deviation, IQ 175, sd 15 respectively IQ 180, sd 16
- One In A Thousand Society
- OATHS is an international high IQ Society, at the 99.9th percentile of intelligence, dedicated to the friendship and communication among intellectually gifted adults.
- Poetic Genius Society
- The Poetic Genius Society is a high IQ society composed of intellectually gifted individuals with a passion for poetry. They are the creative artists of our time, whose literary output interprets the heritage of the past and the urgent now.
- The Prometheus Society
- Membership in the society is open to anyone who has received a score on an accepted IQ test that is equal to or greater than that received by the highest one thirty-thousandth of the general population.
- Thinkers International
- A fellowship of highly intelligent people around the globe, an email discussion group. Many of the members are members of Mensa or other Hi-IQ groups but there is no requirement for such.
- Triple Nine Society
- A high-IQ group open to anyone scoring at or above the 99.9th percentile, approximately 150, on specified IQ tests.