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However, we can healthilyâ¦ assume that had some equivalent of an IQ test existed in history, that great thinkers such as Socrates, da Vinci, Isaac Newton, and so forth would have score up there.   Marilyn vos Savant has a IQ of 230. She has the highest recognised IQ score.
There is also no highest IQ possible. Most tests have a maximum possible score you can get on them (For example, the most common professional test in the USA, WAIS, has a maximum possible score of 160 SD 15). However, in theory IQ has no limitation.