There is no single agreed‑upon “smartest person in the world,” but a few living people are often discussed because of extremely high measured IQ or extraordinary intellectual achievement.

Quick Scoop

If you mean “smartest” in the narrow sense of highest recorded IQ, some records and media outlets currently point to Dr. YoungHoon Kim , a South Korean scholar whose IQ has been reported at 276 and recognized by several record‑keeping organizations; he is frequently described in headlines as having “the world’s highest IQ.”

If you mean “smartest” in the broader, everyday sense—world‑class problem‑solving, creativity, and impact—people usually bring up names like Terence Tao (mathematics), Christopher Hirata , Marilyn vos Savant , and others, while also noting that intelligence is multi‑dimensional and not truly rankable.

Why there’s no single definitive answer

  • Intelligence is multifaceted : logical reasoning, creativity, emotional intelligence, social skills, practical know‑how, and more.
  • IQ tests measure only specific types of cognitive ability under test conditions, not total life‑ability or wisdom.
  • Different domains produce different “smartest” people: math, physics, entrepreneurship, art, social leadership, etc.
  • Many experts argue that asking for the smartest person oversimplifies how human ability works and turns a nuanced trait into a leaderboard.

A nice way to think about it is: the person with the absolute highest test score might not be the most insightful entrepreneur, the most original artist, or the wisest leader—and vice versa.

Names that often come up today

These are some of the living figures frequently mentioned in “who’s the smartest?” discussions, each for a different reason.

  • YoungHoon Kim (often cited highest IQ) – South Korean polymath whose IQ of 276 has been reported as a world record by several record‑oriented bodies and widely repeated in media; his work spans psychology, neuroscience, linguistics, philosophy, and theology.
  • Terence Tao (mathematical genius) – Australian‑American mathematician with an estimated IQ around 230, Fields Medalist, and one of the most celebrated problem‑solvers in modern mathematics, known for deep work in harmonic analysis, PDEs, and number theory.
  • Christopher Hirata – Astrophysicist and cosmologist who was the youngest American to win a gold medal at the International Physics Olympiad and later worked with NASA on cosmology; often cited in “highest IQ” and “smartest” lists.
  • Kim Ung‑Yong – South Korean former child prodigy with a reported IQ over 200 who spoke multiple languages as a small child and reportedly worked with NASA at a young age.
  • Marilyn vos Savant – Once listed by Guinness World Records for an exceptionally high IQ; well‑known for her Parade magazine column explaining logic and math puzzles to a mass audience.

Many online lists also mix in historical figures (Einstein, Newton, von Neumann) when people talk about “smartest ever,” but that is even more speculative because we cannot test them directly and rely on achievements and anecdotes.

How forums and social media talk about it

In public forums and discussions, you see several recurring themes:

  • Some users argue that trying to crown one “smartest person” doesn’t make sense because people excel in different domains and contexts.
  • Others point to viral headlines about YoungHoon Kim, especially where he’s described as “the smartest person on the planet” and even quoted making bold predictions about things like Bitcoin’s future.
  • Some threads focus on “smartest ever in history,” debating names like von Neumann, Newton, Gauss, and others, but those debates are highly subjective and often turn into fun, speculative ranking games rather than serious science.

So if you’re reading comments or Reddit chains about “who is the smartest person in the world,” you’re mostly seeing opinion, hype, and the echo of a few record claims, not a scientific consensus.

A simple way to frame it

If you want a clean takeaway you can use in conversation:

There’s no scientifically agreed “smartest person in the world,” because intelligence is complex and can’t be fully captured by one number. However, some record‑oriented organizations and media stories currently highlight Dr. YoungHoon Kim, with a reported IQ of 276, as having the highest measured score, while experts often point to people like Terence Tao and other top researchers as examples of extraordinary real‑world intellect.

Bottom note: Information gathered from public forums or data available on the internet and portrayed here.