HIGHEST vs LOWEST IQ Countries in the World 2026

Which country samples recorded the highest and lowest online IQ-test averages? Explore the top 30 vs bottom 30 in International IQ Test’s 2026 release, using results from self-selected participants who took the test in 2025. The Data Inspector counts down 60 country samples side by side, from rank 30 to rank 1 in each group. See how South Korea, Japan, the United States, the United Kingdom, Canada, Australia and more compare in this online dataset. Watch for close scores, rounded ties and the gap between the highest and lowest sample averages. This country comparison highlights the published online test results and the sampling context needed to interpret them. Where does your country’s participant sample appear, and which comparison caught your attention? Share your thoughts in the comments, and subscribe to The Data Inspector for more data comparisons and ranking videos. Data source: [International IQ Test — IQ by Country, 2026 release (2025 participant data)](https://international-iq-test.com/en/test/IQ_by_country) Disclaimer: Scores come from **International IQ Test’s 2026 release**, based on **self-selected online participants in 2025**. They reflect website sample averages, **not representative national IQ estimates or individual ability**. Rankings cover 137 eligible countries and follow the source’s groupings and tie order. Results depend on who participates; annual changes compare different samples and **do not establish national intelligence trends**. This video is for educational and informational purposes. #OnlineIQTest #CountryComparison #DataInspector