Nasiruddin Humayun (Persian: نصيرالدين همايون) (March 6, 1508 – February 22, 1556), was the second Mughal Emperor who ruled Afghanistan, Pakistan,and the northern parts of India from 1530–1540 and again from 1555–1556. Like his father, Babur, he lost his kingdom early, but with Persian aid, he eventually regained an even larger one.

He succeeded his father in India in 1530, while his half-brother Kamran Mirza, who was to become a rather bitter rival, obtained the sovereignty of Kabul and Lahore, the more northern parts of their fathers empire. He originally ascended the throne at the age of 22 and was somewhat inexperienced when he came to power.