7. Leonardo da Vinci – IQ 180-190

In a similar fashion to Albert Einstein, Leonardo da Vinci’s IQ is based mostly on speculation, judging by how technologically advanced and how much before their time his inventions were. Experts believe that Da Vinci’s IQ was within the 180-190 range, making him one of the smartest people in history. Leonardo da Vinci is also one of the first polymaths, an expert in various fields like sculpting, painting, geology, cartography, mathematics, and engineering.