Nader Shah's invasion of India is an important foreign invasion of India in 1738-39.

Nader Shah, the Shah of Iran (1736–47) and founder of the Afsharid dynasty, invades India with a fifty-five thousand strong army, eventually attacking Delhi in March 1739 where he sacks the city, after issuing orders for a general massacre to take place.

His army had defeated the Mughal emperor Muhammad Shah at the battle at Karnal and had taken over control of northern India.

His brutal and bloody actions give rise to the word nadirshahi, meaning holocaust.