Who are the smartest Humans in the DC Universe after Lex Luthor?

#1 is no sweat. Who are #2 and #3? Is there a list?

In the DC Universe under most canon and under most continuities, the smartest man on the DC Earth is Lex Luthor. Everything else after that has some kind of caveat which makes it hard to determine who number two might be, or if it even matters.

Whose intellect is listed after his is a much more challenging question.

Many writers want to make Batman the second smartest individual in the DC Universe. Okay, in this picture, while riding the Mobius Chair, he was possibly the smartest man in the Universe but normally, he shouldn’t be.

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