Who has the highest IQ in the world and what is it?

Although everyone thinks it's Steven Hawking with an IQ or slightly over 200, it's actually Marilyn vos Savant with and IQ of 228.

Please be sure to note however, that results can very from test to test and from day to day.

There is no set way to measure intelligence as there are too many aspects to take into account (memory, problem-solving, etc), so don't put too much faith in your IQ rating. You could easily score 140 on an IQ test and still seem dumber than the dog next door. :-)