Highest IQ??? I'm doing a project on IQ and for posters I'm doing some information on the person with the Highest IQ in the world. Unfortunately, this seems to be a difficult thing to determine. Marilyn Vos Savant is supposed to have the highest IQ according to Guiness. But Guiness isn't really commonly used in Scientific discussions as a source of knowledge. Regardless, I tried to find this on the site and couldn't. Some sites state William James Sikes was supposed to have had the highest IQ of all time. Other's say this is just a farce. The things the sites say he was capable of are amazing, but it's difficult to say if their true. Some sites say Goethe or Leonardo da Vinci were the most intelligent in the World. Is there a designated most intelligent individual with the highest IQ? Or am I better off just taking a few people and saying on the poster something like? Who do you think it is? Thanks to anyone who responds.