Top 5 High IQ Societies Around the World

Not everyone who scores high on an IQ test is seeking a certificate to hang on the wall. Many people are looking for intellectual community, stimulating discussion, and meaningful challenge. That’s where high IQ societies come in — exclusive organizations that unite individuals with exceptional cognitive ability.

If you want a deeper understanding of IQ itself, check out our complete guide to IQ or explore our IQ scores and ranges guide to see how intelligence is measured globally.

1. Mensa International — The Most Recognized Name

Founded: 1946  |  IQ Requirement: Top 2% (typically IQ 130+)

Mensa is the most famous and largest high IQ society globally, with over 145,000 members across 100+ countries. It accepts scores from approved standardized intelligence tests and even offers its own supervised admission tests. The word “Mensa” means “table” in Latin — symbolizing a round table where everyone is equal regardless of background.

Members gain access to global networking events, local chapter meetups, exclusive publications, seminars, and Special Interest Groups (SIGs) spanning hundreds of topics. If you’re considering online tests before joining, learn whether they qualify in our guide: Can You Join Mensa with an Online IQ Test?

2. Intertel — Intellectual Fellowship with a Personal Touch

Founded: 1966  |  IQ Requirement: Top 1% (typically IQ 135+)

Intertel is smaller and more intimate than Mensa, with a focus on deep, thoughtful discourse. It fosters genuine friendships among like-minded individuals who value introspection and intellectual growth. Members contribute to high-quality journals and essays, attend annual gatherings in unique destinations, and benefit from a more selective, tightly knit community than Mensa’s larger network.

To see how your IQ fits these elite thresholds, explore our breakdowns for IQ 132 and IQ 138.

3. Triple Nine Society — For the Top 0.1%

Founded: 1978  |  IQ Requirement: 99.9th percentile (IQ 146+)

The Triple Nine Society (TNS) is one of the most elite IQ societies, limiting membership to those in the top 1 in 1,000 of the population. Members are predominantly engineers, scientists, philosophers, and mathematicians who engage in highly intellectual discussions on politics, science, and existential topics. The society publishes a digital and print journal called Vidya. Admission requires submission of test scores from approved high-ceiling intelligence tests — our High Range IQ Test guide explains what these involve.

4. Prometheus Society — Ultra-Elite, Hyper-Selective

Founded: 1982  |  IQ Requirement: 99.997th percentile (IQ 160+)

Prometheus is among the rarest and most exclusive IQ societies, admitting only individuals with scores in the top 0.003% of the population — sometimes called “the Mensa of Mensa.” With fewer than 100 active members, all discussions happen through internal mailing lists and forums. Members are often polymaths with groundbreaking ideas across multiple disciplines.

If you want to understand the cognitive profile of individuals at this level, read our breakdowns for IQ 150 and IQ 143.

5. The International Society for Philosophical Enquiry (ISPE) — Where Brains Meet Purpose

Founded: 1974  |  IQ Requirement: Top 0.1% (around IQ 148+)

The ISPE differs from other societies by emphasizing “intellect with purpose.” It encourages members to apply their intelligence in meaningful ways — to benefit society, science, and the arts. Members collaborate on global mission-oriented projects and thought leadership initiatives across disciplines. For related insights on developing your cognitive potential, explore our guide on whether IQ can be improved and our article on neuroplasticity of the brain.

Which One Should You Join?

If you’re looking for casual interaction and events, Mensa or Intertel might suit you. If you’re craving the highest levels of discourse, Triple Nine or Prometheus could be your intellectual home. And if you’re purpose-driven, ISPE might align best with your values.

The first step is knowing your IQ. Try our free IQ test guide to get an initial benchmark, then explore the full High IQ Societies hub for more on each organization and how to apply.