Zain-ud-Din Khan known as Zain Khan Sirhindi (died 14 January 1764) was the Mughal Faujdar of Sirhind, a serviceman of Shah Alam II, and an ally of Najib-ud-Daula and Ahmad Shah Durrani. Zain Khan Sirhindi fought during the Third Battle of Panipat and strengthened Mughal rule in the region.