On Dal (died 590), commonly referred to by Koreans as "On Dal the Fool" (babo ondal (바보 온달)), was a Goguryeo General and the husband of Princess Pyeonggang.

A legend tells that he was unusually tall, his face was handsome, and he had a good heart.

Though of middle-class origin, he later married King Pyeongwon of Goguryeo's daughter Princess Pyeonggang and then become a general.

[2] He died bravely leading the Goguryeo garrison in 590 at Achasanseong Fortress during a battle against the Silla army.

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